summaryrefslogtreecommitdiff
path: root/mysql-test/main/cte_recursive.result
blob: 6f30de39b46c710e112200d85db24c94a17fc5e0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
create table t1 (a int, b varchar(32));
insert into t1 values
(4,'aaaa' ), (7,'bb'), (1,'ccc'), (4,'dd');
insert into t1 values
(3,'eee'), (7,'bb'), (1,'fff'), (4,'ggg');
with recursive
t as 
(
select * from t1 where t1.b >= 'c'
  union
select * from r
),
r as
(
select * from t
union
select t1.* from t1,r where r.a+1 = t1.a
)
select * from r;
ERROR HY000: Unacceptable mutual recursion with anchored table 't'
with recursive
a1(a,b) as
(select * from t1 where t1.a>3
union
select * from b1 where b1.a >3
union
select * from c1 where c1.a>3),
b1(a,b) as
(select * from a1 where a1.b > 'ccc'
union
select * from c1 where c1.b > 'ddd'),
c1(a,b) as
(select * from a1 where a1.a<6 and a1.b< 'zz'
union
select * from b1 where b1.b > 'auu')
select * from c1;
ERROR HY000: Unacceptable mutual recursion with anchored table 'a1'
drop table t1;
# WITH RECURSIVE vs just WITH
create table t1 (a int);
insert into t1 values
(0), (1), (2), (3), (4);
create table t2 (a int);
insert into t2 values
(1), (2), (3), (4), (5);
# just WITH : s refers to t defined after s
with 
s(a) as (select t.a + 10 from t),
t(a) as (select t1.a from t1)
select * from s;
ERROR 42S02: Table 'test.t' doesn't exist
# WITH RECURSIVE: s refers to t defined after s
with recursive 
s(a) as (select t.a + 10 from t),
t(a) as (select t1.a from t1)
select * from s;
a
10
11
12
13
14
# just WITH : defined t1 is non-recursive and uses base tables t1,t2
with
t1 as
(
select a  from t2 where t2.a=3
union
select t2.a from t1,t2 where t1.a+1=t2.a
)
select * from t1;
a
3
1
2
4
5
explain
with
t1 as
(
select a  from t2 where t2.a=3
union
select t2.a from t1,t2 where t1.a+1=t2.a
)
select * from t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	30	
2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	5	Using where
3	UNION	t1	ALL	NULL	NULL	NULL	NULL	5	
3	UNION	t2	ALL	NULL	NULL	NULL	NULL	5	Using where; Using join buffer (flat, BNL join)
NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	
#WITH RECURSIVE : defined t1 is recursive and uses only base table t2
with recursive
t1 as
(
select a  from t2 where t2.a=3
union
select t2.a from t1,t2 where t1.a+1=t2.a
)
select * from t1;
a
3
4
5
explain
with recursive
t1 as
(
select a  from t2 where t2.a=3
union
select t2.a from t1,t2 where t1.a+1=t2.a
)
select * from t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	5	
2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	5	Using where
3	RECURSIVE UNION	<derived2>	ALL	NULL	NULL	NULL	NULL	5	
3	RECURSIVE UNION	t2	ALL	NULL	NULL	NULL	NULL	5	Using where; Using join buffer (flat, BNL join)
NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	
# just WITH : types of t1 columns are determined by all parts of union 
create view v1 as
with
t1 as
(
select a  from t2 where t2.a=3
union
select t2.a+1 from t1,t2 where t1.a=t2.a
)
select * from t1;
show columns from v1;
Field	Type	Null	Key	Default	Extra
a	bigint(12)	YES		NULL	
# WITH RECURSIVE : types of t1 columns are determined by anchor parts 
create view v2 as
with recursive
t1 as
(
select a  from t2 where t2.a=3
union
select t2.a+1 from t1,t2 where t1.a=t2.a
)
select * from t1;
show columns from v2;
Field	Type	Null	Key	Default	Extra
a	int(11)	YES		NULL	
drop view v1,v2;
drop table t1,t2;
create table  folks(id int, name char(32), dob date, father int, mother int);
insert into folks values
(100, 'Me', '2000-01-01', 20, 30),
(20, 'Dad', '1970-02-02', 10, 9),
(30, 'Mom', '1975-03-03', 8, 7),
(10, 'Grandpa Bill', '1940-04-05', null, null),
(9, 'Grandma Ann', '1941-10-15', null, null),
(25, 'Uncle Jim', '1968-11-18', 8, 7),
(98, 'Sister Amy', '2001-06-20', 20, 30),
(7, 'Grandma Sally', '1943-08-23', null, 6),
(8, 'Grandpa Ben', '1940-10-21', null, null),
(6, 'Grandgrandma Martha', '1923-05-17', null, null),
(67, 'Cousin Eddie', '1992-02-28', 25, 27),
(27, 'Auntie Melinda', '1971-03-29', null, null);
# simple recursion with one anchor and one recursive select
# the anchor is the first select in the specification 
with recursive 
ancestors
as
(
select *
from folks
where name = 'Me' and dob = '2000-01-01'
  union 
select p.id, p.name, p.dob, p.father, p.mother
from folks as p, ancestors AS a
where p.id = a.father or p.id = a.mother
)
select * from ancestors;
id	name	dob	father	mother
100	Me	2000-01-01	20	30
20	Dad	1970-02-02	10	9
30	Mom	1975-03-03	8	7
10	Grandpa Bill	1940-04-05	NULL	NULL
9	Grandma Ann	1941-10-15	NULL	NULL
7	Grandma Sally	1943-08-23	NULL	6
8	Grandpa Ben	1940-10-21	NULL	NULL
6	Grandgrandma Martha	1923-05-17	NULL	NULL
# simple recursion with one anchor and one recursive select
# the anchor is the last select in the specification 
with recursive 
ancestors
as
(
select p.*
from folks as p, ancestors AS a
where p.id = a.father or p.id = a.mother
union
select *
from folks
where name = 'Me' and dob = '2000-01-01'
)
select * from ancestors;
id	name	dob	father	mother
100	Me	2000-01-01	20	30
20	Dad	1970-02-02	10	9
30	Mom	1975-03-03	8	7
10	Grandpa Bill	1940-04-05	NULL	NULL
9	Grandma Ann	1941-10-15	NULL	NULL
7	Grandma Sally	1943-08-23	NULL	6
8	Grandpa Ben	1940-10-21	NULL	NULL
6	Grandgrandma Martha	1923-05-17	NULL	NULL
# simple recursion with one anchor and one recursive select
# the anchor is the first select in the specification 
with recursive
ancestors
as
(
select *
from folks
where name = 'Cousin Eddie'
  union 
select p.*
from folks as p, ancestors as a
where p.id = a.father or p.id = a.mother
)
select * from ancestors;
id	name	dob	father	mother
67	Cousin Eddie	1992-02-28	25	27
25	Uncle Jim	1968-11-18	8	7
27	Auntie Melinda	1971-03-29	NULL	NULL
7	Grandma Sally	1943-08-23	NULL	6
8	Grandpa Ben	1940-10-21	NULL	NULL
6	Grandgrandma Martha	1923-05-17	NULL	NULL
# simple recursion with or in anchor and or in recursive part 
with recursive
ancestors
as
(
select *
from  folks
where name = 'Me' or name='Sister Amy'
   union 
select  p.*
from folks as p, ancestors as a
where p.id = a.father or p.id = a.mother
)
select * from ancestors;
id	name	dob	father	mother
100	Me	2000-01-01	20	30
98	Sister Amy	2001-06-20	20	30
20	Dad	1970-02-02	10	9
30	Mom	1975-03-03	8	7
10	Grandpa Bill	1940-04-05	NULL	NULL
9	Grandma Ann	1941-10-15	NULL	NULL
7	Grandma Sally	1943-08-23	NULL	6
8	Grandpa Ben	1940-10-21	NULL	NULL
6	Grandgrandma Martha	1923-05-17	NULL	NULL
# two recursive definition, one uses another
with recursive 
prev_gen
as
(
select folks.*
from folks, prev_gen
where folks.id=prev_gen.father or folks.id=prev_gen.mother
union
select * 
from folks
where name='Me'
),
ancestors
as
(
select *
from folks
where name='Me'
  union 
select *
from ancestors
union
select *
from prev_gen
)
select ancestors.name, ancestors.dob from ancestors;
name	dob
Me	2000-01-01
Dad	1970-02-02
Mom	1975-03-03
Grandpa Bill	1940-04-05
Grandma Ann	1941-10-15
Grandma Sally	1943-08-23
Grandpa Ben	1940-10-21
Grandgrandma Martha	1923-05-17
# recursive definition with two attached non-recursive
with recursive 
ancestors(id,name,dob)
as
(
with 
father(child_id,id,name,dob)
as
(
select folks.id, f.id, f.name, f.dob
from folks, folks f
where folks.father=f.id 
),
mother(child_id,id,name,dob)
as
(
select folks.id, m.id, m.name, m.dob
from folks, folks m
where folks.mother=m.id 
)  
select folks.id, folks.name, folks.dob
from folks
where name='Me'
  union 
select f.id, f.name, f.dob
from ancestors a, father f
where f.child_id=a.id
union 
select m.id, m.name, m.dob
from ancestors a, mother m
where m.child_id=a.id
)
select ancestors.name, ancestors.dob from ancestors;
name	dob
Me	2000-01-01
Dad	1970-02-02
Mom	1975-03-03
Grandpa Bill	1940-04-05
Grandpa Ben	1940-10-21
Grandma Ann	1941-10-15
Grandma Sally	1943-08-23
Grandgrandma Martha	1923-05-17
# simple recursion with one anchor and one recursive select
# the anchor is the first select in the specification 
with recursive
descendants
as
(
select *
from folks
where name = 'Grandpa Bill'
  union 
select folks.*
from folks, descendants as d
where d.id=folks.father or d.id=folks.mother
)
select * from descendants;
id	name	dob	father	mother
10	Grandpa Bill	1940-04-05	NULL	NULL
20	Dad	1970-02-02	10	9
100	Me	2000-01-01	20	30
98	Sister Amy	2001-06-20	20	30
# simple recursion with one anchor and one recursive select
# the anchor is the first select in the specification 
with recursive
descendants
as
(
select *
from folks
where name = 'Grandma Sally'
  union 
select folks.*
from folks, descendants as d
where d.id=folks.father or d.id=folks.mother
)
select * from descendants;
id	name	dob	father	mother
7	Grandma Sally	1943-08-23	NULL	6
30	Mom	1975-03-03	8	7
25	Uncle Jim	1968-11-18	8	7
100	Me	2000-01-01	20	30
98	Sister Amy	2001-06-20	20	30
67	Cousin Eddie	1992-02-28	25	27
# simple recursive table used three times in the main query
with recursive
ancestors
as
(
select *
from folks 
where name = 'Me' and dob = '2000-01-01'
  union
select p.*   
from folks as p, ancestors AS a   
where p.id = a.father OR p.id = a.mother
)
select *
from ancestors t1, ancestors t2 
where exists (select * from ancestors a 
where a.father=t1.id AND a.mother=t2.id);
id	name	dob	father	mother	id	name	dob	father	mother
20	Dad	1970-02-02	10	9	30	Mom	1975-03-03	8	7
10	Grandpa Bill	1940-04-05	NULL	NULL	9	Grandma Ann	1941-10-15	NULL	NULL
8	Grandpa Ben	1940-10-21	NULL	NULL	7	Grandma Sally	1943-08-23	NULL	6
# simple recursive table used three times in the main query
with 
ancestor_couples(husband, h_dob, wife, w_dob)
as
(
with recursive 
ancestors
as
(
select *
from folks 
where name = 'Me'
  union
select p.*   
from folks as p, ancestors AS a   
where p.id = a.father OR p.id = a.mother
)
select t1.name, t1.dob, t2.name, t2.dob
from ancestors t1, ancestors t2 
where exists (select * from ancestors a 
where a.father=t1.id AND a.mother=t2.id)
)
select * from ancestor_couples;
husband	h_dob	wife	w_dob
Dad	1970-02-02	Mom	1975-03-03
Grandpa Bill	1940-04-05	Grandma Ann	1941-10-15
Grandpa Ben	1940-10-21	Grandma Sally	1943-08-23
# simple recursion with two selects in recursive part
with recursive
ancestors
as
(
select *
from folks 
where name = 'Me'
  union 
select p.*
from folks as p, ancestors as fa
where p.id = fa.father
union
select p.*
from folks as p, ancestors as ma
where p.id = ma.mother
)
select * from ancestors;
id	name	dob	father	mother
100	Me	2000-01-01	20	30
20	Dad	1970-02-02	10	9
30	Mom	1975-03-03	8	7
10	Grandpa Bill	1940-04-05	NULL	NULL
8	Grandpa Ben	1940-10-21	NULL	NULL
9	Grandma Ann	1941-10-15	NULL	NULL
7	Grandma Sally	1943-08-23	NULL	6
6	Grandgrandma Martha	1923-05-17	NULL	NULL
# mutual recursion with renaming
with recursive
ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
w_id, w_name, w_dob, w_father, w_mother)
as
(
select h.*, w.*
from folks h, folks w,  coupled_ancestors a
where a.father = h.id AND a.mother = w.id
union
select h.*, w.*
from folks v, folks h, folks w
where v.name = 'Me' and
(v.father = h.id AND v.mother= w.id)
),
coupled_ancestors (id, name, dob, father, mother)
as
(
select h_id, h_name, h_dob, h_father, h_mother
from ancestor_couples
union
select w_id, w_name, w_dob, w_father, w_mother
from ancestor_couples
)
select h_name, h_dob, w_name, w_dob
from ancestor_couples;
h_name	h_dob	w_name	w_dob
Dad	1970-02-02	Mom	1975-03-03
Grandpa Bill	1940-04-05	Grandma Ann	1941-10-15
Grandpa Ben	1940-10-21	Grandma Sally	1943-08-23
# mutual recursion with union all
with recursive
ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
w_id, w_name, w_dob, w_father, w_mother)
as
(
select h.*, w.*
from folks h, folks w,  coupled_ancestors a
where a.father = h.id AND a.mother = w.id
union 
select h.*, w.*
from folks v, folks h, folks w
where v.name = 'Me' and
(v.father = h.id AND v.mother= w.id)
),
coupled_ancestors (id, name, dob, father, mother)
as
(
select h_id, h_name, h_dob, h_father, h_mother
from ancestor_couples
union all
select w_id, w_name, w_dob, w_father, w_mother
from ancestor_couples
)
select h_name, h_dob, w_name, w_dob
from ancestor_couples;
h_name	h_dob	w_name	w_dob
Dad	1970-02-02	Mom	1975-03-03
Grandpa Bill	1940-04-05	Grandma Ann	1941-10-15
Grandpa Ben	1940-10-21	Grandma Sally	1943-08-23
# mutual recursion with renaming
with recursive
ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
w_id, w_name, w_dob, w_father, w_mother)
as
(
select h.*, w.*
from folks h, folks w,  coupled_ancestors a
where a.father = h.id AND a.mother = w.id
union
select h.*, w.*
from folks v, folks h, folks w
where v.name = 'Me' and
(v.father = h.id AND v.mother= w.id)
),
coupled_ancestors (id, name, dob, father, mother)
as
(
select h_id, h_name, h_dob, h_father, h_mother
from ancestor_couples
union
select w_id, w_name, w_dob, w_father, w_mother
from ancestor_couples
)
select h_name, h_dob, w_name, w_dob
from ancestor_couples;
h_name	h_dob	w_name	w_dob
Dad	1970-02-02	Mom	1975-03-03
Grandpa Bill	1940-04-05	Grandma Ann	1941-10-15
Grandpa Ben	1940-10-21	Grandma Sally	1943-08-23
# mutual recursion with union all
with recursive
ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
w_id, w_name, w_dob, w_father, w_mother)
as
(
select h.*, w.*
from folks h, folks w,  coupled_ancestors a
where a.father = h.id AND a.mother = w.id
),
coupled_ancestors (id, name, dob, father, mother)
as
(
select * 
from folks 
where name = 'Me'
  union all
select h_id, h_name, h_dob, h_father, h_mother
from ancestor_couples
union all
select w_id, w_name, w_dob, w_father, w_mother
from ancestor_couples
)
select h_name, h_dob, w_name, w_dob
from ancestor_couples;
h_name	h_dob	w_name	w_dob
Dad	1970-02-02	Mom	1975-03-03
Grandpa Bill	1940-04-05	Grandma Ann	1941-10-15
Grandpa Ben	1940-10-21	Grandma Sally	1943-08-23
# mutual recursion with one select in the first definition
with recursive
ancestor_couple_ids(h_id, w_id)
as
(
select a.father, a.mother
from coupled_ancestors a
where a.father is not null and a.mother is not null
),
coupled_ancestors (id, name, dob, father, mother)
as
(
select * 
from folks 
where name = 'Me'
  union all
select p.*
from folks p, ancestor_couple_ids fa
where p.id = fa.h_id
union all
select p.*
from folks p, ancestor_couple_ids ma
where p.id = ma.w_id
)
select *
from ancestor_couple_ids;
h_id	w_id
20	30
10	9
8	7
# join of a mutually recursive table with base tables
with recursive
ancestor_couple_ids(h_id, w_id)
as
(
select a.father, a.mother
from coupled_ancestors a
where a.father is not null and a.mother is not null
),
coupled_ancestors (id, name, dob, father, mother)
as
(
select * 
from folks 
where name = 'Me'
  union all
select p.*
from folks p, ancestor_couple_ids fa
where p.id = fa.h_id
union all
select p.*
from folks p, ancestor_couple_ids ma
where p.id = ma.w_id
)
select h.name, h.dob, w.name, w.dob
from ancestor_couple_ids c, folks h, folks w
where c.h_id = h.id and c.w_id= w.id;
name	dob	name	dob
Dad	1970-02-02	Mom	1975-03-03
Grandpa Bill	1940-04-05	Grandma Ann	1941-10-15
Grandpa Ben	1940-10-21	Grandma Sally	1943-08-23
# join of two mutually recursive tables
with recursive
ancestor_couple_ids(h_id, w_id)
as
(
select a.father, a.mother
from coupled_ancestors a
where a.father is not null and a.mother is not null
),
coupled_ancestors (id, name, dob, father, mother)
as
(
select * 
from folks 
where name = 'Me'
  union all
select p.*
from folks p, ancestor_couple_ids fa
where p.id = fa.h_id
union all
select p.*
from folks p, ancestor_couple_ids ma
where p.id = ma.w_id
)
select h.name, h.dob, w.name, w.dob
from ancestor_couple_ids c, coupled_ancestors h, coupled_ancestors w
where c.h_id = h.id and c.w_id= w.id;
name	dob	name	dob
Dad	1970-02-02	Mom	1975-03-03
Grandpa Bill	1940-04-05	Grandma Ann	1941-10-15
Grandpa Ben	1940-10-21	Grandma Sally	1943-08-23
explain extended
with recursive
ancestor_couple_ids(h_id, w_id)
as
(
select a.father, a.mother
from coupled_ancestors a
where a.father is not null and a.mother is not null
),
coupled_ancestors (id, name, dob, father, mother)
as
(
select * 
from folks 
where name = 'Me'
  union all
select p.*
from folks p, ancestor_couple_ids fa
where p.id = fa.h_id
union all
select p.*
from folks p, ancestor_couple_ids ma
where p.id = ma.w_id
)
select h.name, h.dob, w.name, w.dob
from ancestor_couple_ids c, coupled_ancestors h, coupled_ancestors w
where c.h_id = h.id and c.w_id= w.id;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
1	PRIMARY	<derived3>	ref	key0	key0	5	c.h_id	2	100.00	
1	PRIMARY	<derived3>	ref	key0	key0	5	c.w_id	2	100.00	
3	DERIVED	folks	ALL	NULL	NULL	NULL	NULL	12	100.00	Using where
4	RECURSIVE UNION	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	
4	RECURSIVE UNION	p	ALL	NULL	NULL	NULL	NULL	12	100.00	Using where; Using join buffer (flat, BNL join)
5	RECURSIVE UNION	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	
5	RECURSIVE UNION	p	ALL	NULL	NULL	NULL	NULL	12	100.00	Using where; Using join buffer (flat, BNL join)
NULL	UNION RESULT	<union3,4,5>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
2	DERIVED	<derived3>	ALL	NULL	NULL	NULL	NULL	12	100.00	Using where
Warnings:
Note	1003	with recursive ancestor_couple_ids(h_id,w_id) as (/* select#2 */ select `a`.`father` AS `h_id`,`a`.`mother` AS `w_id` from `coupled_ancestors` `a` where `a`.`father` is not null and `a`.`mother` is not null), coupled_ancestors(id,name,dob,father,mother) as (/* select#3 */ select `test`.`folks`.`id` AS `id`,`test`.`folks`.`name` AS `name`,`test`.`folks`.`dob` AS `dob`,`test`.`folks`.`father` AS `father`,`test`.`folks`.`mother` AS `mother` from `test`.`folks` where `test`.`folks`.`name` = 'Me' union all /* select#4 */ select `test`.`p`.`id` AS `id`,`test`.`p`.`name` AS `name`,`test`.`p`.`dob` AS `dob`,`test`.`p`.`father` AS `father`,`test`.`p`.`mother` AS `mother` from `test`.`folks` `p` join `ancestor_couple_ids` `fa` where `test`.`p`.`id` = `fa`.`h_id` union all /* select#5 */ select `test`.`p`.`id` AS `id`,`test`.`p`.`name` AS `name`,`test`.`p`.`dob` AS `dob`,`test`.`p`.`father` AS `father`,`test`.`p`.`mother` AS `mother` from `test`.`folks` `p` join `ancestor_couple_ids` `ma` where `test`.`p`.`id` = `ma`.`w_id`)/* select#1 */ select `h`.`name` AS `name`,`h`.`dob` AS `dob`,`w`.`name` AS `name`,`w`.`dob` AS `dob` from `ancestor_couple_ids` `c` join `coupled_ancestors` `h` join `coupled_ancestors` `w` where `h`.`id` = `c`.`h_id` and `w`.`id` = `c`.`w_id`
# simple mutual recursion
with recursive
ancestor_couple_ids(h_id, w_id)
as
(
select a.father, a.mother
from coupled_ancestors a
),
coupled_ancestors (id, name, dob, father, mother)
as
(
select * 
from folks 
where name = 'Me'
  union all
select p.*
from folks p, ancestor_couple_ids fa
where p.id = fa.h_id
union all
select p.*
from folks p, ancestor_couple_ids ma
where p.id = ma.w_id
)
select *
from ancestor_couple_ids;
h_id	w_id
20	30
10	9
8	7
NULL	NULL
NULL	NULL
NULL	NULL
NULL	6
NULL	NULL
# join of two mutually recursive tables
with recursive
ancestor_couple_ids(h_id, w_id)
as
(
select a.father, a.mother
from coupled_ancestors a
),
coupled_ancestors (id, name, dob, father, mother)
as
(
select * 
from folks 
where name = 'Me'
  union all
select p.*
from folks p, ancestor_couple_ids fa
where p.id = fa.h_id
union all
select p.*
from folks p, ancestor_couple_ids ma
where p.id = ma.w_id
)
select h.name, h.dob, w.name, w.dob
from ancestor_couple_ids c, coupled_ancestors h, coupled_ancestors w
where c.h_id = h.id and c.w_id= w.id;
name	dob	name	dob
Dad	1970-02-02	Mom	1975-03-03
Grandpa Bill	1940-04-05	Grandma Ann	1941-10-15
Grandpa Ben	1940-10-21	Grandma Sally	1943-08-23
# execution of prepared query using a recursive table
prepare stmt1 from "
with recursive 
ancestors
as
(
  select *
    from folks
      where name = 'Me' and dob = '2000-01-01'
  union 
  select p.id, p.name, p.dob, p.father, p.mother
    from folks as p, ancestors AS a
      where p.id = a.father or p.id = a.mother
)
select * from ancestors;
";
execute stmt1;
id	name	dob	father	mother
100	Me	2000-01-01	20	30
20	Dad	1970-02-02	10	9
30	Mom	1975-03-03	8	7
10	Grandpa Bill	1940-04-05	NULL	NULL
9	Grandma Ann	1941-10-15	NULL	NULL
7	Grandma Sally	1943-08-23	NULL	6
8	Grandpa Ben	1940-10-21	NULL	NULL
6	Grandgrandma Martha	1923-05-17	NULL	NULL
execute stmt1;
id	name	dob	father	mother
100	Me	2000-01-01	20	30
20	Dad	1970-02-02	10	9
30	Mom	1975-03-03	8	7
10	Grandpa Bill	1940-04-05	NULL	NULL
9	Grandma Ann	1941-10-15	NULL	NULL
7	Grandma Sally	1943-08-23	NULL	6
8	Grandpa Ben	1940-10-21	NULL	NULL
6	Grandgrandma Martha	1923-05-17	NULL	NULL
deallocate prepare stmt1;
# view using a recursive table
create view v1 as
with recursive 
ancestors
as
(
select *
from folks
where name = 'Me' and dob = '2000-01-01'
  union 
select p.id, p.name, p.dob, p.father, p.mother
from folks as p, ancestors AS a
where p.id = a.father or p.id = a.mother
)
select * from ancestors;
show create view v1;
View	Create View	character_set_client	collation_connection
v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS with recursive ancestors as (select `test`.`folks`.`id` AS `id`,`test`.`folks`.`name` AS `name`,`test`.`folks`.`dob` AS `dob`,`test`.`folks`.`father` AS `father`,`test`.`folks`.`mother` AS `mother` from `test`.`folks` where `test`.`folks`.`name` = 'Me' and `test`.`folks`.`dob` = '2000-01-01' union select `p`.`id` AS `id`,`p`.`name` AS `name`,`p`.`dob` AS `dob`,`p`.`father` AS `father`,`p`.`mother` AS `mother` from (`test`.`folks` `p` join `ancestors` `a`) where `p`.`id` = `a`.`father` or `p`.`id` = `a`.`mother`)select `ancestors`.`id` AS `id`,`ancestors`.`name` AS `name`,`ancestors`.`dob` AS `dob`,`ancestors`.`father` AS `father`,`ancestors`.`mother` AS `mother` from `ancestors`	latin1	latin1_swedish_ci
select * from v1;
id	name	dob	father	mother
100	Me	2000-01-01	20	30
20	Dad	1970-02-02	10	9
30	Mom	1975-03-03	8	7
10	Grandpa Bill	1940-04-05	NULL	NULL
9	Grandma Ann	1941-10-15	NULL	NULL
7	Grandma Sally	1943-08-23	NULL	6
8	Grandpa Ben	1940-10-21	NULL	NULL
6	Grandgrandma Martha	1923-05-17	NULL	NULL
create view v2 as
with recursive
ancestors
as
(
select *
from folks 
where name = 'Me'
  union 
select p.*
from folks as p, ancestors as fa
where p.id = fa.father
union
select p.*
from folks as p, ancestors as ma
where p.id = ma.mother
)
select * from ancestors;
show create view v2;
View	Create View	character_set_client	collation_connection
v2	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v2` AS with recursive ancestors as (select `test`.`folks`.`id` AS `id`,`test`.`folks`.`name` AS `name`,`test`.`folks`.`dob` AS `dob`,`test`.`folks`.`father` AS `father`,`test`.`folks`.`mother` AS `mother` from `test`.`folks` where `test`.`folks`.`name` = 'Me' union select `p`.`id` AS `id`,`p`.`name` AS `name`,`p`.`dob` AS `dob`,`p`.`father` AS `father`,`p`.`mother` AS `mother` from (`test`.`folks` `p` join `ancestors` `fa`) where `p`.`id` = `fa`.`father` union select `p`.`id` AS `id`,`p`.`name` AS `name`,`p`.`dob` AS `dob`,`p`.`father` AS `father`,`p`.`mother` AS `mother` from (`test`.`folks` `p` join `ancestors` `ma`) where `p`.`id` = `ma`.`mother`)select `ancestors`.`id` AS `id`,`ancestors`.`name` AS `name`,`ancestors`.`dob` AS `dob`,`ancestors`.`father` AS `father`,`ancestors`.`mother` AS `mother` from `ancestors`	latin1	latin1_swedish_ci
select * from v2;
id	name	dob	father	mother
100	Me	2000-01-01	20	30
20	Dad	1970-02-02	10	9
30	Mom	1975-03-03	8	7
10	Grandpa Bill	1940-04-05	NULL	NULL
8	Grandpa Ben	1940-10-21	NULL	NULL
9	Grandma Ann	1941-10-15	NULL	NULL
7	Grandma Sally	1943-08-23	NULL	6
6	Grandgrandma Martha	1923-05-17	NULL	NULL
drop view v1,v2;
explain extended
with recursive 
ancestors
as
(
select *
from folks
where name = 'Me' and dob = '2000-01-01'
  union 
select p.id, p.name, p.dob, p.father, p.mother
from folks as p, ancestors AS a
where p.id = a.father or p.id = a.mother
)
select * from ancestors;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	12	100.00	
2	DERIVED	folks	ALL	NULL	NULL	NULL	NULL	12	100.00	Using where
3	RECURSIVE UNION	p	ALL	NULL	NULL	NULL	NULL	12	100.00	
3	RECURSIVE UNION	<derived2>	ALL	NULL	NULL	NULL	NULL	12	100.00	Using where; Using join buffer (flat, BNL join)
NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
Warnings:
Note	1003	with recursive ancestors as (/* select#2 */ select `test`.`folks`.`id` AS `id`,`test`.`folks`.`name` AS `name`,`test`.`folks`.`dob` AS `dob`,`test`.`folks`.`father` AS `father`,`test`.`folks`.`mother` AS `mother` from `test`.`folks` where `test`.`folks`.`name` = 'Me' and `test`.`folks`.`dob` = DATE'2000-01-01' union /* select#3 */ select `p`.`id` AS `id`,`p`.`name` AS `name`,`p`.`dob` AS `dob`,`p`.`father` AS `father`,`p`.`mother` AS `mother` from `test`.`folks` `p` join `ancestors` `a` where `a`.`father` = `p`.`id` or `a`.`mother` = `p`.`id`)/* select#1 */ select `ancestors`.`id` AS `id`,`ancestors`.`name` AS `name`,`ancestors`.`dob` AS `dob`,`ancestors`.`father` AS `father`,`ancestors`.`mother` AS `mother` from `ancestors`
# recursive spec with two anchor selects and two recursive ones 
with recursive
ancestor_ids (id)
as
(
select father from folks where name = 'Me'
  union
select mother from folks where name = 'Me'
  union
select father from folks, ancestor_ids a  where folks.id = a.id
union
select mother from folks, ancestor_ids a  where folks.id = a.id
),
ancestors 
as
(
select p.* from folks as p, ancestor_ids as a
where p.id = a.id
)
select * from ancestors;
id	name	dob	father	mother
20	Dad	1970-02-02	10	9
30	Mom	1975-03-03	8	7
10	Grandpa Bill	1940-04-05	NULL	NULL
9	Grandma Ann	1941-10-15	NULL	NULL
7	Grandma Sally	1943-08-23	NULL	6
8	Grandpa Ben	1940-10-21	NULL	NULL
6	Grandgrandma Martha	1923-05-17	NULL	NULL
# recursive spec using union all 
with recursive
ancestors
as
(
select *
from folks 
where name = 'Me'
  union all
select p.*
from folks as p, ancestors as fa
where p.id = fa.father
union all
select p.*
from folks as p, ancestors as ma
where p.id = ma.mother
)
select * from ancestors;
id	name	dob	father	mother
100	Me	2000-01-01	20	30
20	Dad	1970-02-02	10	9
30	Mom	1975-03-03	8	7
10	Grandpa Bill	1940-04-05	NULL	NULL
8	Grandpa Ben	1940-10-21	NULL	NULL
9	Grandma Ann	1941-10-15	NULL	NULL
7	Grandma Sally	1943-08-23	NULL	6
6	Grandgrandma Martha	1923-05-17	NULL	NULL
with recursive
ancestor_ids (id, generation)
as
(
select father, 1 from folks where name = 'Me' and  father is not null
union all
select mother, 1 from folks where name = 'Me' and  mother is not null
union all
select father, fa.generation+1 from folks, ancestor_ids fa
where folks.id = fa.id and (father not in (select id from ancestor_ids))
union all
select mother, ma.generation+1 from folks, ancestor_ids ma
where folks.id = ma.id and (mother not in (select id from ancestor_ids))
)
select generation, name from ancestor_ids a, folks
where a.id = folks.id;
ERROR HY000: Restrictions imposed on recursive definitions are violated for table 'ancestor_ids'
set standard_compliant_cte=0;
with recursive
ancestor_ids (id, generation)
as
(
select father from folks where name = 'Me' and  father is not null
union all
select mother from folks where name = 'Me' and  mother is not null
union all
select father, fa.generation+1 from folks, ancestor_ids fa
where folks.id = fa.id and (father not in (select id from ancestor_ids))
union all
select mother, ma.generation+1 from folks, ancestor_ids ma
where folks.id = ma.id and (mother not in (select id from ancestor_ids))
)
select generation, name from ancestor_ids a, folks
where a.id = folks.id;
ERROR HY000: WITH column list and SELECT field list have different column counts
with recursive
ancestor_ids (id, generation)
as
(
select father, 1 from folks where name = 'Me' and  father is not null
union all
select mother, 1 from folks where name = 'Me' and  mother is not null
union all
select father, fa.generation+1 from folks, ancestor_ids fa
where folks.id = fa.id and father is not null and
(father not in (select id from ancestor_ids))
union all
select mother, ma.generation+1 from folks, ancestor_ids ma
where folks.id = ma.id and mother is not null and
(mother not in (select id from ancestor_ids))
)
select generation, name from ancestor_ids a, folks
where a.id = folks.id;
generation	name
1	Dad
1	Mom
2	Grandpa Bill
2	Grandma Ann
2	Grandma Sally
2	Grandpa Ben
3	Grandgrandma Martha
set standard_compliant_cte=1;
with recursive
coupled_ancestor_ids (id)
as
(
select father from folks where name = 'Me' and father is not null
union 
select mother from folks where name = 'Me' and mother is not null
union
select n.father 
from folks, coupled_ancestor_ids fa, coupled_ancestor_ids ma, folks n
where folks.father = fa.id and folks.mother = ma.id and
(fa.id = n.id or ma.id = n.id) and
n.father is not null and n.mother is not null 
union
select n.mother 
from folks, coupled_ancestor_ids fa, coupled_ancestor_ids ma, folks n
where folks.father = fa.id and folks.mother = ma.id and 
(fa.id = n.id or ma.id = n.id) and 
n.father is not null and n.mother is not null 
)
select p.* from coupled_ancestor_ids a, folks p
where a.id = p.id;
ERROR HY000: Restrictions imposed on recursive definitions are violated for table 'coupled_ancestor_ids'
set statement standard_compliant_cte=0 for
with recursive
coupled_ancestor_ids (id)
as
(
select father from folks where name = 'Me' and father is not null
union 
select mother from folks where name = 'Me' and mother is not null
union
select n.father 
from folks, coupled_ancestor_ids fa, coupled_ancestor_ids ma, folks n
where folks.father = fa.id and folks.mother = ma.id and
(fa.id = n.id or ma.id = n.id) and
n.father is not null and n.mother is not null 
union
select n.mother 
from folks, coupled_ancestor_ids fa, coupled_ancestor_ids ma, folks n
where folks.father = fa.id and folks.mother = ma.id and 
(fa.id = n.id or ma.id = n.id) and 
n.father is not null and n.mother is not null 
)
select p.* from coupled_ancestor_ids a, folks p
where a.id = p.id;
id	name	dob	father	mother
20	Dad	1970-02-02	10	9
30	Mom	1975-03-03	8	7
10	Grandpa Bill	1940-04-05	NULL	NULL
9	Grandma Ann	1941-10-15	NULL	NULL
7	Grandma Sally	1943-08-23	NULL	6
8	Grandpa Ben	1940-10-21	NULL	NULL
with recursive
ancestor_ids (id)
as
(
select father from folks where name = 'Me'
  union
select mother from folks where name = 'Me'
  union
select father from folks left join ancestor_ids a on folks.id = a.id
union
select mother from folks left join ancestor_ids a on folks.id = a.id
),
ancestors 
as
(
select p.* from folks as p, ancestor_ids as a
where p.id = a.id
)
select * from ancestors;
ERROR HY000: Restrictions imposed on recursive definitions are violated for table 'ancestor_ids'
set statement standard_compliant_cte=0 for
with recursive
ancestor_ids (id)
as
(
select father from folks where name = 'Me'
  union
select mother from folks where name = 'Me'
  union
select father from folks left join ancestor_ids a on folks.id = a.id
union
select mother from folks left join ancestor_ids a on folks.id = a.id
),
ancestors 
as
(
select p.* from folks as p, ancestor_ids as a
where p.id = a.id
)
select * from ancestors;
id	name	dob	father	mother
20	Dad	1970-02-02	10	9
30	Mom	1975-03-03	8	7
10	Grandpa Bill	1940-04-05	NULL	NULL
9	Grandma Ann	1941-10-15	NULL	NULL
25	Uncle Jim	1968-11-18	8	7
7	Grandma Sally	1943-08-23	NULL	6
8	Grandpa Ben	1940-10-21	NULL	NULL
6	Grandgrandma Martha	1923-05-17	NULL	NULL
27	Auntie Melinda	1971-03-29	NULL	NULL
with recursive
ancestor_ids (id, generation)
as
(
select father, 1 from folks where name = 'Me'
  union
select mother, 1 from folks where name = 'Me'
  union
select father, a.generation+1 from folks, ancestor_ids a
where folks.id = a.id
union
select mother, a.generation+1 from folks, ancestor_ids a
where folks.id = a.id
),
ancestors 
as
(
select generation, name from folks as p, ancestor_ids as a
where p.id = a.id
)
select * from ancestors;
generation	name
1	Dad
1	Mom
2	Grandpa Bill
2	Grandma Ann
2	Grandma Sally
2	Grandpa Ben
3	Grandgrandma Martha
with recursive
ancestor_ids (id, generation)
as
(
select father, 1 from folks where name = 'Me'
  union
select mother, 1 from folks where name = 'Me'
  union
select max(father), max(a.generation)+1 from folks, ancestor_ids a
where folks.id = a.id
group by a.generation
union
select max(mother), max(a.generation)+1 from folks, ancestor_ids a
where folks.id = a.id
group by a.generation
),
ancestors 
as
(
select generation, name from folks as p, ancestor_ids as a
where p.id = a.id
)
select * from ancestors;
ERROR HY000: Restrictions imposed on recursive definitions are violated for table 'ancestor_ids'
set statement standard_compliant_cte=0 for
with recursive
ancestor_ids (id, generation)
as
(
select father, 1 from folks where name = 'Me'
  union
select mother, 1 from folks where name = 'Me'
  union
select max(father), a.generation+1 from folks, ancestor_ids a
where folks.id = a.id
group by a.generation
union
select max(mother), a.generation+1 from folks, ancestor_ids a
where folks.id = a.id
group by a.generation
),
ancestors 
as
(
select generation, name from folks as p, ancestor_ids as a
where p.id = a.id
)
select * from ancestors;
generation	name
1	Dad
1	Mom
2	Grandpa Bill
2	Grandma Ann
set statement max_recursive_iterations=1 for
with recursive
ancestor_ids (id, generation)
as
(
select father, 1 from folks where name = 'Me'
  union
select mother, 1 from folks where name = 'Me'
  union
select father, a.generation+1 from folks, ancestor_ids a
where folks.id = a.id
union
select mother, a.generation+1 from folks, ancestor_ids a
where folks.id = a.id
),
ancestors 
as
(
select generation, name from folks as p, ancestor_ids as a
where p.id = a.id
)
select * from ancestors;
generation	name
1	Dad
1	Mom
2	Grandpa Bill
2	Grandma Ann
2	Grandma Sally
2	Grandpa Ben
# query with recursive tables using key access
alter table folks add primary key (id);
explain
with recursive
ancestors
as
(
select *
from folks 
where name = 'Me'
  union 
select p.*
from folks as p, ancestors as fa
where p.id = fa.father
union
select p.*
from folks as p, ancestors as ma
where p.id = ma.mother
)
select * from ancestors;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	12	
2	DERIVED	folks	ALL	NULL	NULL	NULL	NULL	12	Using where
3	RECURSIVE UNION	p	ALL	PRIMARY	NULL	NULL	NULL	12	
3	RECURSIVE UNION	<derived2>	ref	key0	key0	5	test.p.id	2	
4	RECURSIVE UNION	p	ALL	PRIMARY	NULL	NULL	NULL	12	
4	RECURSIVE UNION	<derived2>	ref	key0	key0	5	test.p.id	2	
NULL	UNION RESULT	<union2,3,4>	ALL	NULL	NULL	NULL	NULL	NULL	
with recursive
ancestors
as
(
select *
from folks 
where name = 'Me'
  union 
select p.*
from folks as p, ancestors as fa
where p.id = fa.father
union
select p.*
from folks as p, ancestors as ma
where p.id = ma.mother
)
select * from ancestors;
id	name	dob	father	mother
100	Me	2000-01-01	20	30
20	Dad	1970-02-02	10	9
30	Mom	1975-03-03	8	7
10	Grandpa Bill	1940-04-05	NULL	NULL
8	Grandpa Ben	1940-10-21	NULL	NULL
9	Grandma Ann	1941-10-15	NULL	NULL
7	Grandma Sally	1943-08-23	NULL	6
6	Grandgrandma Martha	1923-05-17	NULL	NULL
#
# EXPLAIN FORMAT=JSON on a query where one recursive CTE uses another:
#
explain 
with recursive 
prev_gen
as
(
select folks.*
from folks, prev_gen
where folks.id=prev_gen.father or folks.id=prev_gen.mother
union
select * 
from folks
where name='Me'
),
ancestors
as
(
select *
from folks
where name='Me'
  union 
select *
from ancestors
union
select *
from prev_gen
)
select ancestors.name, ancestors.dob from ancestors;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	<derived4>	ALL	NULL	NULL	NULL	NULL	24	
4	DERIVED	folks	ALL	NULL	NULL	NULL	NULL	12	Using where
6	UNION	<derived3>	ALL	NULL	NULL	NULL	NULL	12	
5	RECURSIVE UNION	<derived4>	ALL	NULL	NULL	NULL	NULL	24	
NULL	UNION RESULT	<union4,6,5>	ALL	NULL	NULL	NULL	NULL	NULL	
3	DERIVED	folks	ALL	NULL	NULL	NULL	NULL	12	Using where
2	RECURSIVE UNION	folks	ALL	PRIMARY	NULL	NULL	NULL	12	
2	RECURSIVE UNION	<derived3>	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
NULL	UNION RESULT	<union3,2>	ALL	NULL	NULL	NULL	NULL	NULL	
explain FORMAT=JSON
with recursive 
prev_gen
as
(
select folks.*
from folks, prev_gen
where folks.id=prev_gen.father or folks.id=prev_gen.mother
union
select * 
from folks
where name='Me'
),
ancestors
as
(
select *
from folks
where name='Me2'
  union 
select *
from ancestors where id < 234
union
select *
from prev_gen where id < 345
)
select ancestors.name, ancestors.dob from ancestors;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "<derived4>",
      "access_type": "ALL",
      "rows": 24,
      "filtered": 100,
      "materialized": {
        "query_block": {
          "recursive_union": {
            "table_name": "<union4,6,5>",
            "access_type": "ALL",
            "query_specifications": [
              {
                "query_block": {
                  "select_id": 4,
                  "table": {
                    "table_name": "folks",
                    "access_type": "ALL",
                    "rows": 12,
                    "filtered": 100,
                    "attached_condition": "folks.`name` = 'Me2'"
                  }
                }
              },
              {
                "query_block": {
                  "select_id": 6,
                  "operation": "UNION",
                  "table": {
                    "table_name": "<derived3>",
                    "access_type": "ALL",
                    "rows": 12,
                    "filtered": 100,
                    "attached_condition": "prev_gen.`id` < 345",
                    "materialized": {
                      "query_block": {
                        "recursive_union": {
                          "table_name": "<union3,2>",
                          "access_type": "ALL",
                          "query_specifications": [
                            {
                              "query_block": {
                                "select_id": 3,
                                "table": {
                                  "table_name": "folks",
                                  "access_type": "ALL",
                                  "rows": 12,
                                  "filtered": 100,
                                  "attached_condition": "folks.`name` = 'Me'"
                                }
                              }
                            },
                            {
                              "query_block": {
                                "select_id": 2,
                                "operation": "UNION",
                                "table": {
                                  "table_name": "folks",
                                  "access_type": "ALL",
                                  "possible_keys": ["PRIMARY"],
                                  "rows": 12,
                                  "filtered": 100
                                },
                                "block-nl-join": {
                                  "table": {
                                    "table_name": "<derived3>",
                                    "access_type": "ALL",
                                    "rows": 12,
                                    "filtered": 100
                                  },
                                  "buffer_type": "flat",
                                  "buffer_size": "686",
                                  "join_type": "BNL",
                                  "attached_condition": "prev_gen.father = folks.`id` or prev_gen.mother = folks.`id`"
                                }
                              }
                            }
                          ]
                        }
                      }
                    }
                  }
                }
              },
              {
                "query_block": {
                  "select_id": 5,
                  "operation": "UNION",
                  "table": {
                    "table_name": "<derived4>",
                    "access_type": "ALL",
                    "rows": 24,
                    "filtered": 100,
                    "attached_condition": "ancestors.`id` < 234"
                  }
                }
              }
            ]
          }
        }
      }
    }
  }
}
#
explain format=json
with recursive
ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
w_id, w_name, w_dob, w_father, w_mother)
as
(
select h.*, w.*
from folks h, folks w,  coupled_ancestors a
where a.father = h.id AND a.mother = w.id
union 
select h.*, w.*
from folks v, folks h, folks w
where v.name = 'Me' and
(v.father = h.id AND v.mother= w.id)
),
coupled_ancestors (id, name, dob, father, mother)
as
(
select h_id, h_name, h_dob, h_father, h_mother
from ancestor_couples
union all
select w_id, w_name, w_dob, w_father, w_mother
from ancestor_couples
)
select h_name, h_dob, w_name, w_dob
from ancestor_couples;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "<derived3>",
      "access_type": "ALL",
      "rows": 12,
      "filtered": 100,
      "materialized": {
        "query_block": {
          "recursive_union": {
            "table_name": "<union3,2>",
            "access_type": "ALL",
            "query_specifications": [
              {
                "query_block": {
                  "select_id": 3,
                  "table": {
                    "table_name": "v",
                    "access_type": "ALL",
                    "rows": 12,
                    "filtered": 100,
                    "attached_condition": "v.`name` = 'Me' and v.father is not null and v.mother is not null"
                  },
                  "table": {
                    "table_name": "h",
                    "access_type": "eq_ref",
                    "possible_keys": ["PRIMARY"],
                    "key": "PRIMARY",
                    "key_length": "4",
                    "used_key_parts": ["id"],
                    "ref": ["test.v.father"],
                    "rows": 1,
                    "filtered": 100
                  },
                  "table": {
                    "table_name": "w",
                    "access_type": "eq_ref",
                    "possible_keys": ["PRIMARY"],
                    "key": "PRIMARY",
                    "key_length": "4",
                    "used_key_parts": ["id"],
                    "ref": ["test.v.mother"],
                    "rows": 1,
                    "filtered": 100
                  }
                }
              },
              {
                "query_block": {
                  "select_id": 2,
                  "operation": "UNION",
                  "table": {
                    "table_name": "<derived4>",
                    "access_type": "ALL",
                    "rows": 2,
                    "filtered": 100,
                    "attached_condition": "a.father is not null and a.mother is not null"
                  },
                  "table": {
                    "table_name": "h",
                    "access_type": "eq_ref",
                    "possible_keys": ["PRIMARY"],
                    "key": "PRIMARY",
                    "key_length": "4",
                    "used_key_parts": ["id"],
                    "ref": ["a.father"],
                    "rows": 1,
                    "filtered": 100
                  },
                  "table": {
                    "table_name": "w",
                    "access_type": "eq_ref",
                    "possible_keys": ["PRIMARY"],
                    "key": "PRIMARY",
                    "key_length": "4",
                    "used_key_parts": ["id"],
                    "ref": ["a.mother"],
                    "rows": 1,
                    "filtered": 100
                  }
                }
              }
            ]
          }
        }
      }
    }
  }
}
create table my_ancestors
with recursive
ancestor_ids (id)
as
(
select father from folks where name = 'Me'
  union
select mother from folks where name = 'Me'
  union
select father from folks, ancestor_ids a  where folks.id = a.id
union
select mother from folks, ancestor_ids a  where folks.id = a.id
)
select p.* from folks as p, ancestor_ids as a where p.id = a.id;
select * from my_ancestors;
id	name	dob	father	mother
20	Dad	1970-02-02	10	9
30	Mom	1975-03-03	8	7
10	Grandpa Bill	1940-04-05	NULL	NULL
9	Grandma Ann	1941-10-15	NULL	NULL
7	Grandma Sally	1943-08-23	NULL	6
8	Grandpa Ben	1940-10-21	NULL	NULL
6	Grandgrandma Martha	1923-05-17	NULL	NULL
delete from my_ancestors;
insert into my_ancestors 
with recursive
ancestor_ids (id)
as
(
select father from folks where name = 'Me'
  union
select mother from folks where name = 'Me'
  union
select father from folks, ancestor_ids a  where folks.id = a.id
union
select mother from folks, ancestor_ids a  where folks.id = a.id
)
select p.* from folks as p, ancestor_ids as a where p.id = a.id;
select * from my_ancestors;
id	name	dob	father	mother
20	Dad	1970-02-02	10	9
30	Mom	1975-03-03	8	7
10	Grandpa Bill	1940-04-05	NULL	NULL
9	Grandma Ann	1941-10-15	NULL	NULL
7	Grandma Sally	1943-08-23	NULL	6
8	Grandpa Ben	1940-10-21	NULL	NULL
6	Grandgrandma Martha	1923-05-17	NULL	NULL
drop table my_ancestors;
WITH RECURSIVE
positions(i) AS (
VALUES(0)
UNION SELECT ALL
i+1 FROM positions WHERE i < 4*4-1
),
solutions(board, n_queens) AS (
SELECT REPEAT('-', 4*4), 0
FROM positions
UNION
SELECT
concat(substr(board, 1, i),'*',substr(board, i+2)),n_queens + 1 AS n_queens
FROM positions AS ps, solutions
WHERE n_queens < 4
AND substr(board,1,i) != '*'
      AND NOT EXISTS (
SELECT 1 FROM positions WHERE
substr(board,i+1,1) = '*' AND
(
i % 4 = ps.i % 4 OR
i div 4 = ps.i div 4 OR
i div 4 + (i % 4) = ps.i div 4 + (ps.i % 4) OR
i div 4 - (i % 4) = ps.i div 4 - (ps.i % 4)
)
)
)
SELECT regexp_replace(board,concat('(',REPEAT('.', 4),')'),'\\1\n') n_queens FROM solutions WHERE n_queens = 4;
n_queens
--*-
*---
---*
-*--

-*--
---*
*---
--*-

#
# MDEV-10883: execution of prepared statement from SELECT
#             with recursive CTE that renames columns
#
prepare stmt from"
with recursive
ancestor_ids (id)
as
(
  select father from folks where name = 'Me'
  union
  select mother from folks where name = 'Me'
  union
  select father from folks, ancestor_ids a  where folks.id = a.id
  union
  select mother from folks, ancestor_ids a  where folks.id = a.id
)
select p.* from folks as p, ancestor_ids as a where p.id = a.id;
";
execute stmt;
id	name	dob	father	mother
20	Dad	1970-02-02	10	9
30	Mom	1975-03-03	8	7
10	Grandpa Bill	1940-04-05	NULL	NULL
9	Grandma Ann	1941-10-15	NULL	NULL
7	Grandma Sally	1943-08-23	NULL	6
8	Grandpa Ben	1940-10-21	NULL	NULL
6	Grandgrandma Martha	1923-05-17	NULL	NULL
deallocate prepare stmt;
#
# MDEV-10881: execution of prepared statement from
#             CREATE ... SELECT, INSERT ... SELECT       
#
prepare stmt from"
create table my_ancestors
with recursive
ancestor_ids (id)
as
(
  select father from folks where name = 'Me'
  union
  select mother from folks where name = 'Me'
  union
  select father from folks, ancestor_ids a  where folks.id = a.id
  union
  select mother from folks, ancestor_ids a  where folks.id = a.id
)
select p.* from folks as p, ancestor_ids as a where p.id = a.id;
";
execute stmt;
deallocate prepare stmt;
select * from my_ancestors;
id	name	dob	father	mother
20	Dad	1970-02-02	10	9
30	Mom	1975-03-03	8	7
10	Grandpa Bill	1940-04-05	NULL	NULL
9	Grandma Ann	1941-10-15	NULL	NULL
7	Grandma Sally	1943-08-23	NULL	6
8	Grandpa Ben	1940-10-21	NULL	NULL
6	Grandgrandma Martha	1923-05-17	NULL	NULL
delete from my_ancestors;
prepare stmt from"
insert into my_ancestors
with recursive
ancestor_ids (id)
as
(
  select father from folks where name = 'Me'
  union
  select mother from folks where name = 'Me'
  union
  select father from folks, ancestor_ids a  where folks.id = a.id
  union
  select mother from folks, ancestor_ids a  where folks.id = a.id
)
select p.* from folks as p, ancestor_ids as a where p.id = a.id;
";
execute stmt;
deallocate prepare stmt;
select * from my_ancestors;
id	name	dob	father	mother
20	Dad	1970-02-02	10	9
30	Mom	1975-03-03	8	7
10	Grandpa Bill	1940-04-05	NULL	NULL
9	Grandma Ann	1941-10-15	NULL	NULL
7	Grandma Sally	1943-08-23	NULL	6
8	Grandpa Ben	1940-10-21	NULL	NULL
6	Grandgrandma Martha	1923-05-17	NULL	NULL
drop table my_ancestors;
#
# MDEV-10933: WITH clause together with SELECT in parenthesis
#             CREATE SELECT      
#
create table my_ancestors
(
with recursive
ancestor_ids (id)
as
(
select father from folks where name = 'Me'
  union
select mother from folks where name = 'Me'
  union
select father from folks, ancestor_ids a  where folks.id = a.id
union
select mother from folks, ancestor_ids a  where folks.id = a.id
)
select p.* from folks as p, ancestor_ids as a where p.id = a.id
);
select * from my_ancestors;
id	name	dob	father	mother
20	Dad	1970-02-02	10	9
30	Mom	1975-03-03	8	7
10	Grandpa Bill	1940-04-05	NULL	NULL
9	Grandma Ann	1941-10-15	NULL	NULL
7	Grandma Sally	1943-08-23	NULL	6
8	Grandpa Ben	1940-10-21	NULL	NULL
6	Grandgrandma Martha	1923-05-17	NULL	NULL
drop table my_ancestors;
drop table folks;
#
# MDEV-10372: [bb-10.2-mdev9864 tree] EXPLAIN with recursive CTE enters endless recursion
#
create table t1(a int);
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
explain format=json 
with recursive t as (select a from t1 union select a+10 from t where a < 1000) 
select  * from t;
EXPLAIN
{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "<derived2>",
      "access_type": "ALL",
      "rows": 10,
      "filtered": 100,
      "materialized": {
        "query_block": {
          "recursive_union": {
            "table_name": "<union2,3>",
            "access_type": "ALL",
            "query_specifications": [
              {
                "query_block": {
                  "select_id": 2,
                  "table": {
                    "table_name": "t1",
                    "access_type": "ALL",
                    "rows": 10,
                    "filtered": 100
                  }
                }
              },
              {
                "query_block": {
                  "select_id": 3,
                  "operation": "UNION",
                  "table": {
                    "table_name": "<derived2>",
                    "access_type": "ALL",
                    "rows": 10,
                    "filtered": 100,
                    "attached_condition": "t.a < 1000"
                  }
                }
              }
            ]
          }
        }
      }
    }
  }
}
drop table t1;
#
# MDEV-10737: recursive union with several anchors at the end
#
WITH RECURSIVE cte(n) AS
( SELECT n+1 FROM cte WHERE n < 5 UNION SELECT 1 UNION SELECT 1 )
SELECT * FROM cte;
n
1
2
3
4
5
#
# MDEV-10736: recursive definition with anchor over a table with blob
#
CREATE TABLE t1 (f VARCHAR(1024));
WITH RECURSIVE cte(f) AS
(SELECT t1.f FROM t1 UNION ALL SELECT cte.f FROM cte) 
SELECT * FROM cte as t;
f
DROP TABLE t1;
#
# MDEV-10899: mergeable derived in the spec of recursive CTE
#
create table t1 (a int);
insert into t1 values
(0), (1), (2), (3), (4);
create table t2 (a int);
insert into t2 values
(1), (2), (3), (4), (5);
with recursive
t1 as
(
select x.a from (select a from t2 where t2.a=3) x
union
select t2.a from t1,t2 where t1.a+1=t2.a
)
select * from t1;
a
3
4
5
explain
with recursive
t1 as
(
select x.a from (select a from t2 where t2.a=3) x
union
select t2.a from t1,t2 where t1.a+1=t2.a
)
select * from t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	5	
2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	5	Using where
4	RECURSIVE UNION	<derived2>	ALL	NULL	NULL	NULL	NULL	5	
4	RECURSIVE UNION	t2	ALL	NULL	NULL	NULL	NULL	5	Using where; Using join buffer (flat, BNL join)
NULL	UNION RESULT	<union2,4>	ALL	NULL	NULL	NULL	NULL	NULL	
drop table t1,t2;
#
# MDEV-11278: non-mergeable view in the spec of recursive CTE
#
create table t1 (a int);
insert into t1 values
(0), (1), (2), (3), (4);
create table t2 (a int);
insert into t2 values
(1), (2), (3), (4), (5);
create view v1 as
select a from t2 where a < 3
union
select a from t2 where a > 4;
with recursive
t1 as
(
select a from v1 where a=1 
union
select v1.a from t1,v1 where t1.a+1=v1.a
)
select * from t1;
a
1
2
drop view v1;
drop table t1,t2;
#
# MDEV-11259: recursive CTE with concatenation operation
#
DROP TABLE IF EXISTS edges;
Warnings:
Note	1051	Unknown table 'test.edges'
CREATE TABLE edges(
a int(10) unsigned NOT NULL,
b int(10) unsigned NOT NULL,
PRIMARY KEY (a,b),
KEY b(b)
);
INSERT INTO edges
VALUES (1,3),(2,1),(2,4),(3,4),(3,5),(3,6),(4,7),(5,1),(5,6),(6,1);
DROP TABLE IF EXISTS edges2;
Warnings:
Note	1051	Unknown table 'test.edges2'
CREATE VIEW edges2 (a, b) AS 
SELECT a, b FROM edges   UNION ALL   SELECT b, a FROM edges;
WITH RECURSIVE transitive_closure(a, b, distance, path_string) AS
( SELECT a, b, 1 AS distance,
concat(a, '.', b, '.') AS path_string
FROM edges
UNION ALL
SELECT tc.a, e.b, tc.distance + 1,
concat(tc.path_string, e.b, '.') AS path_string
FROM edges AS e
JOIN transitive_closure AS tc
ON e.a = tc.b
WHERE tc.path_string NOT LIKE concat('%', e.b, '.%')
)
SELECT * FROM transitive_closure
ORDER BY a, b, distance;
a	b	distance	path_string
1	3	1	1.3.
1	4	2	1.3.4.
1	5	2	1.3.5.
1	6	2	1.3.6.
1	6	3	1.3.5.6.
1	7	3	1.3.4.7.
2	1	1	2.1.
2	3	2	2.1.3.
2	4	1	2.4.
2	4	3	2.1.3.4.
2	5	3	2.1.3.5.
2	6	3	2.1.3.6.
2	6	4	2.1.3.5.6.
2	7	2	2.4.7.
2	7	4	2.1.3.4.7.
3	1	2	3.5.1.
3	1	2	3.6.1.
3	1	3	3.5.6.1.
3	4	1	3.4.
3	5	1	3.5.
3	6	1	3.6.
3	6	2	3.5.6.
3	7	2	3.4.7.
4	7	1	4.7.
5	1	1	5.1.
5	1	2	5.6.1.
5	3	2	5.1.3.
5	3	3	5.6.1.3.
5	4	3	5.1.3.4.
5	4	4	5.6.1.3.4.
5	6	1	5.6.
5	6	3	5.1.3.6.
5	7	4	5.1.3.4.7.
5	7	5	5.6.1.3.4.7.
6	1	1	6.1.
6	3	2	6.1.3.
6	4	3	6.1.3.4.
6	5	3	6.1.3.5.
6	7	4	6.1.3.4.7.
WITH RECURSIVE transitive_closure(a, b, distance, path_string) AS
( SELECT a, b, 1 AS distance,
concat(a, '.', b, '.') AS path_string
FROM edges
WHERE a = 1 -- source
UNION ALL
SELECT tc.a, e.b, tc.distance + 1,
concat(tc.path_string, e.b, '.') AS path_string
FROM edges AS e
JOIN transitive_closure AS tc ON e.a = tc.b
WHERE tc.path_string NOT LIKE concat('%', e.b, '.%')
)
SELECT * FROM transitive_closure
WHERE b = 6 -- destination
ORDER BY a, b, distance;
a	b	distance	path_string
1	6	2	1.3.6.
1	6	3	1.3.5.6.
WITH RECURSIVE transitive_closure(a, b, distance, path_string) AS
( SELECT  a, b, 1 AS distance,
concat(a, '.', b, '.') AS path_string
FROM edges2
UNION ALL
SELECT tc.a, e.b, tc.distance + 1,
concat(tc.path_string, e.b, '.') AS path_string
FROM edges2 AS e
JOIN transitive_closure AS tc ON e.a = tc.b
WHERE tc.path_string NOT LIKE concat('%', e.b, '.%')
)
SELECT * FROM transitive_closure
ORDER BY a, b, distance;
a	b	distance	path_string
1	2	1	1.2.
1	2	3	1.3.4.2.
1	2	4	1.5.3.4.2.
1	2	4	1.6.3.4.2.
1	2	5	1.5.6.3.4.2.
1	2	5	1.6.5.3.4.2.
1	3	1	1.3.
1	3	2	1.5.3.
1	3	2	1.6.3.
1	3	3	1.2.4.3.
1	3	3	1.5.6.3.
1	3	3	1.6.5.3.
1	4	2	1.2.4.
1	4	2	1.3.4.
1	4	3	1.5.3.4.
1	4	3	1.6.3.4.
1	4	4	1.5.6.3.4.
1	4	4	1.6.5.3.4.
1	5	1	1.5.
1	5	2	1.3.5.
1	5	2	1.6.5.
1	5	3	1.3.6.5.
1	5	3	1.6.3.5.
1	5	4	1.2.4.3.5.
1	5	5	1.2.4.3.6.5.
1	6	1	1.6.
1	6	2	1.3.6.
1	6	2	1.5.6.
1	6	3	1.3.5.6.
1	6	3	1.5.3.6.
1	6	4	1.2.4.3.6.
1	6	5	1.2.4.3.5.6.
1	7	3	1.2.4.7.
1	7	3	1.3.4.7.
1	7	4	1.5.3.4.7.
1	7	4	1.6.3.4.7.
1	7	5	1.5.6.3.4.7.
1	7	5	1.6.5.3.4.7.
2	1	1	2.1.
2	1	3	2.4.3.1.
2	1	4	2.4.3.5.1.
2	1	4	2.4.3.6.1.
2	1	5	2.4.3.5.6.1.
2	1	5	2.4.3.6.5.1.
2	3	2	2.1.3.
2	3	2	2.4.3.
2	3	3	2.1.5.3.
2	3	3	2.1.6.3.
2	3	4	2.1.5.6.3.
2	3	4	2.1.6.5.3.
2	4	1	2.4.
2	4	3	2.1.3.4.
2	4	4	2.1.5.3.4.
2	4	4	2.1.6.3.4.
2	4	5	2.1.5.6.3.4.
2	4	5	2.1.6.5.3.4.
2	5	2	2.1.5.
2	5	3	2.1.3.5.
2	5	3	2.1.6.5.
2	5	3	2.4.3.5.
2	5	4	2.1.3.6.5.
2	5	4	2.1.6.3.5.
2	5	4	2.4.3.1.5.
2	5	4	2.4.3.6.5.
2	5	5	2.4.3.1.6.5.
2	5	5	2.4.3.6.1.5.
2	6	2	2.1.6.
2	6	3	2.1.3.6.
2	6	3	2.1.5.6.
2	6	3	2.4.3.6.
2	6	4	2.1.3.5.6.
2	6	4	2.1.5.3.6.
2	6	4	2.4.3.1.6.
2	6	4	2.4.3.5.6.
2	6	5	2.4.3.1.5.6.
2	6	5	2.4.3.5.1.6.
2	7	2	2.4.7.
2	7	4	2.1.3.4.7.
2	7	5	2.1.5.3.4.7.
2	7	5	2.1.6.3.4.7.
2	7	6	2.1.5.6.3.4.7.
2	7	6	2.1.6.5.3.4.7.
3	1	1	3.1.
3	1	2	3.5.1.
3	1	2	3.6.1.
3	1	3	3.4.2.1.
3	1	3	3.5.6.1.
3	1	3	3.6.5.1.
3	2	2	3.1.2.
3	2	2	3.4.2.
3	2	3	3.5.1.2.
3	2	3	3.6.1.2.
3	2	4	3.5.6.1.2.
3	2	4	3.6.5.1.2.
3	4	1	3.4.
3	4	3	3.1.2.4.
3	4	4	3.5.1.2.4.
3	4	4	3.6.1.2.4.
3	4	5	3.5.6.1.2.4.
3	4	5	3.6.5.1.2.4.
3	5	1	3.5.
3	5	2	3.1.5.
3	5	2	3.6.5.
3	5	3	3.1.6.5.
3	5	3	3.6.1.5.
3	5	4	3.4.2.1.5.
3	5	5	3.4.2.1.6.5.
3	6	1	3.6.
3	6	2	3.1.6.
3	6	2	3.5.6.
3	6	3	3.1.5.6.
3	6	3	3.5.1.6.
3	6	4	3.4.2.1.6.
3	6	5	3.4.2.1.5.6.
3	7	2	3.4.7.
3	7	4	3.1.2.4.7.
3	7	5	3.5.1.2.4.7.
3	7	5	3.6.1.2.4.7.
3	7	6	3.5.6.1.2.4.7.
3	7	6	3.6.5.1.2.4.7.
4	1	2	4.2.1.
4	1	2	4.3.1.
4	1	3	4.3.5.1.
4	1	3	4.3.6.1.
4	1	4	4.3.5.6.1.
4	1	4	4.3.6.5.1.
4	2	1	4.2.
4	2	3	4.3.1.2.
4	2	4	4.3.5.1.2.
4	2	4	4.3.6.1.2.
4	2	5	4.3.5.6.1.2.
4	2	5	4.3.6.5.1.2.
4	3	1	4.3.
4	3	3	4.2.1.3.
4	3	4	4.2.1.5.3.
4	3	4	4.2.1.6.3.
4	3	5	4.2.1.5.6.3.
4	3	5	4.2.1.6.5.3.
4	5	2	4.3.5.
4	5	3	4.2.1.5.
4	5	3	4.3.1.5.
4	5	3	4.3.6.5.
4	5	4	4.2.1.3.5.
4	5	4	4.2.1.6.5.
4	5	4	4.3.1.6.5.
4	5	4	4.3.6.1.5.
4	5	5	4.2.1.3.6.5.
4	5	5	4.2.1.6.3.5.
4	6	2	4.3.6.
4	6	3	4.2.1.6.
4	6	3	4.3.1.6.
4	6	3	4.3.5.6.
4	6	4	4.2.1.3.6.
4	6	4	4.2.1.5.6.
4	6	4	4.3.1.5.6.
4	6	4	4.3.5.1.6.
4	6	5	4.2.1.3.5.6.
4	6	5	4.2.1.5.3.6.
4	7	1	4.7.
5	1	1	5.1.
5	1	2	5.3.1.
5	1	2	5.6.1.
5	1	3	5.3.6.1.
5	1	3	5.6.3.1.
5	1	4	5.3.4.2.1.
5	1	5	5.6.3.4.2.1.
5	2	2	5.1.2.
5	2	3	5.3.1.2.
5	2	3	5.3.4.2.
5	2	3	5.6.1.2.
5	2	4	5.1.3.4.2.
5	2	4	5.3.6.1.2.
5	2	4	5.6.3.1.2.
5	2	4	5.6.3.4.2.
5	2	5	5.1.6.3.4.2.
5	2	5	5.6.1.3.4.2.
5	3	1	5.3.
5	3	2	5.1.3.
5	3	2	5.6.3.
5	3	3	5.1.6.3.
5	3	3	5.6.1.3.
5	3	4	5.1.2.4.3.
5	3	5	5.6.1.2.4.3.
5	4	2	5.3.4.
5	4	3	5.1.2.4.
5	4	3	5.1.3.4.
5	4	3	5.6.3.4.
5	4	4	5.1.6.3.4.
5	4	4	5.3.1.2.4.
5	4	4	5.6.1.2.4.
5	4	4	5.6.1.3.4.
5	4	5	5.3.6.1.2.4.
5	4	5	5.6.3.1.2.4.
5	6	1	5.6.
5	6	2	5.1.6.
5	6	2	5.3.6.
5	6	3	5.1.3.6.
5	6	3	5.3.1.6.
5	6	5	5.1.2.4.3.6.
5	6	5	5.3.4.2.1.6.
5	7	3	5.3.4.7.
5	7	4	5.1.2.4.7.
5	7	4	5.1.3.4.7.
5	7	4	5.6.3.4.7.
5	7	5	5.1.6.3.4.7.
5	7	5	5.3.1.2.4.7.
5	7	5	5.6.1.2.4.7.
5	7	5	5.6.1.3.4.7.
5	7	6	5.3.6.1.2.4.7.
5	7	6	5.6.3.1.2.4.7.
6	1	1	6.1.
6	1	2	6.3.1.
6	1	2	6.5.1.
6	1	3	6.3.5.1.
6	1	3	6.5.3.1.
6	1	4	6.3.4.2.1.
6	1	5	6.5.3.4.2.1.
6	2	2	6.1.2.
6	2	3	6.3.1.2.
6	2	3	6.3.4.2.
6	2	3	6.5.1.2.
6	2	4	6.1.3.4.2.
6	2	4	6.3.5.1.2.
6	2	4	6.5.3.1.2.
6	2	4	6.5.3.4.2.
6	2	5	6.1.5.3.4.2.
6	2	5	6.5.1.3.4.2.
6	3	1	6.3.
6	3	2	6.1.3.
6	3	2	6.5.3.
6	3	3	6.1.5.3.
6	3	3	6.5.1.3.
6	3	4	6.1.2.4.3.
6	3	5	6.5.1.2.4.3.
6	4	2	6.3.4.
6	4	3	6.1.2.4.
6	4	3	6.1.3.4.
6	4	3	6.5.3.4.
6	4	4	6.1.5.3.4.
6	4	4	6.3.1.2.4.
6	4	4	6.5.1.2.4.
6	4	4	6.5.1.3.4.
6	4	5	6.3.5.1.2.4.
6	4	5	6.5.3.1.2.4.
6	5	1	6.5.
6	5	2	6.1.5.
6	5	2	6.3.5.
6	5	3	6.1.3.5.
6	5	3	6.3.1.5.
6	5	5	6.1.2.4.3.5.
6	5	5	6.3.4.2.1.5.
6	7	3	6.3.4.7.
6	7	4	6.1.2.4.7.
6	7	4	6.1.3.4.7.
6	7	4	6.5.3.4.7.
6	7	5	6.1.5.3.4.7.
6	7	5	6.3.1.2.4.7.
6	7	5	6.5.1.2.4.7.
6	7	5	6.5.1.3.4.7.
6	7	6	6.3.5.1.2.4.7.
6	7	6	6.5.3.1.2.4.7.
7	1	3	7.4.2.1.
7	1	3	7.4.3.1.
7	1	4	7.4.3.5.1.
7	1	4	7.4.3.6.1.
7	1	5	7.4.3.5.6.1.
7	1	5	7.4.3.6.5.1.
7	2	2	7.4.2.
7	2	4	7.4.3.1.2.
7	2	5	7.4.3.5.1.2.
7	2	5	7.4.3.6.1.2.
7	2	6	7.4.3.5.6.1.2.
7	2	6	7.4.3.6.5.1.2.
7	3	2	7.4.3.
7	3	4	7.4.2.1.3.
7	3	5	7.4.2.1.5.3.
7	3	5	7.4.2.1.6.3.
7	3	6	7.4.2.1.5.6.3.
7	3	6	7.4.2.1.6.5.3.
7	4	1	7.4.
7	5	3	7.4.3.5.
7	5	4	7.4.2.1.5.
7	5	4	7.4.3.1.5.
7	5	4	7.4.3.6.5.
7	5	5	7.4.2.1.3.5.
7	5	5	7.4.2.1.6.5.
7	5	5	7.4.3.1.6.5.
7	5	5	7.4.3.6.1.5.
7	5	6	7.4.2.1.3.6.5.
7	5	6	7.4.2.1.6.3.5.
7	6	3	7.4.3.6.
7	6	4	7.4.2.1.6.
7	6	4	7.4.3.1.6.
7	6	4	7.4.3.5.6.
7	6	5	7.4.2.1.3.6.
7	6	5	7.4.2.1.5.6.
7	6	5	7.4.3.1.5.6.
7	6	5	7.4.3.5.1.6.
7	6	6	7.4.2.1.3.5.6.
7	6	6	7.4.2.1.5.3.6.
WITH RECURSIVE transitive_closure(a, b, distance, path_string)
AS
( SELECT a, b, 1 AS distance,
concat(a, '.', b, '.') AS path_string
FROM edges2
UNION ALL
SELECT tc.a, e.b, tc.distance + 1,
concat(tc.path_string, e.b, '.') AS path_string
FROM edges2 AS e
JOIN transitive_closure AS tc ON e.a = tc.b
WHERE tc.path_string NOT LIKE concat('%', e.b, '.%')
)
SELECT a, b, min(distance) AS dist FROM transitive_closure
GROUP BY a, b
ORDER BY a, dist, b;
a	b	dist
1	2	1
1	3	1
1	4	2
1	5	1
1	6	1
1	7	3
2	1	1
2	3	2
2	4	1
2	5	2
2	6	2
2	7	2
3	1	1
3	2	2
3	4	1
3	5	1
3	6	1
3	7	2
4	1	2
4	2	1
4	3	1
4	5	2
4	6	2
4	7	1
5	1	1
5	2	2
5	3	1
5	4	2
5	6	1
5	7	3
6	1	1
6	2	2
6	3	1
6	4	2
6	5	1
6	7	3
7	1	3
7	2	2
7	3	2
7	4	1
7	5	3
7	6	3
DROP VIEW edges2;
DROP TABLE edges;
#
# MDEV-11674: recursive CTE table that cannot be stored
#             in a heap table
#
create table t1 (id int, test_data varchar(36));
insert into t1(id, test_data)
select id, test_data
from (
with recursive data_generator(id, test_data) as (
select 1 as id, uuid() as test_data
union all
select id + 1, uuid() from data_generator where id < 150000
)
select * from data_generator
) as a;
drop table t1;
#
# MDEV-10773: ANALYZE for query with recursive CTE
#
analyze format=json 
with recursive src(counter) as 
(select 1 
union 
select counter+1 from src where counter<10
) select * from src;
ANALYZE
{
  "query_block": {
    "select_id": 1,
    "r_loops": 1,
    "r_total_time_ms": "REPLACED",
    "table": {
      "table_name": "<derived2>",
      "access_type": "ALL",
      "r_loops": 1,
      "rows": 2,
      "r_rows": 10,
      "r_total_time_ms": "REPLACED",
      "filtered": 100,
      "r_filtered": 100,
      "materialized": {
        "query_block": {
          "recursive_union": {
            "table_name": "<union2,3>",
            "access_type": "ALL",
            "r_loops": 0,
            "r_rows": null,
            "query_specifications": [
              {
                "query_block": {
                  "select_id": 2,
                  "table": {
                    "message": "No tables used"
                  }
                }
              },
              {
                "query_block": {
                  "select_id": 3,
                  "operation": "UNION",
                  "r_loops": 10,
                  "r_total_time_ms": "REPLACED",
                  "table": {
                    "table_name": "<derived2>",
                    "access_type": "ALL",
                    "r_loops": 10,
                    "rows": 2,
                    "r_rows": 1,
                    "r_total_time_ms": "REPLACED",
                    "filtered": 100,
                    "r_filtered": 90,
                    "attached_condition": "src.counter < 10"
                  }
                }
              }
            ]
          }
        }
      }
    }
  }
}
#
# mdev-12360: recursive reference in left operand of LEFT JOIN
#
create table  folks(id int, name char(32), dob date, father int, mother int);
insert into folks values
(100, 'Me', '2000-01-01', 20, 30),
(20, 'Dad', '1970-02-02', 10, 9),
(30, 'Mom', '1975-03-03', 8, 7),
(10, 'Grandpa Bill', '1940-04-05', null, null),
(9, 'Grandma Ann', '1941-10-15', null, null),
(25, 'Uncle Jim', '1968-11-18', 8, 7),
(98, 'Sister Amy', '2001-06-20', 20, 30),
(7, 'Grandma Sally', '1943-08-23', null, 6),
(8, 'Grandpa Ben', '1940-10-21', null, null),
(6, 'Grandgrandma Martha', '1923-05-17', null, null),
(67, 'Cousin Eddie', '1992-02-28', 25, 27),
(27, 'Auntie Melinda', '1971-03-29', null, null);
with recursive
ancestor_ids (id)
as
(
select father from folks where name = 'Me'
  union
select mother from folks where name = 'Me'
  union
select father from ancestor_ids as a left join folks on folks.id = a.id
union
select mother from ancestor_ids as a left join folks on folks.id = a.id
),
ancestors 
as
(
select p.* from folks as p, ancestor_ids as a
where p.id = a.id
)
select * from ancestors;
id	name	dob	father	mother
20	Dad	1970-02-02	10	9
30	Mom	1975-03-03	8	7
10	Grandpa Bill	1940-04-05	NULL	NULL
9	Grandma Ann	1941-10-15	NULL	NULL
7	Grandma Sally	1943-08-23	NULL	6
8	Grandpa Ben	1940-10-21	NULL	NULL
6	Grandgrandma Martha	1923-05-17	NULL	NULL
drop table folks;
#
# mdev-12368: crash with mutually recursive CTE
#             that arenot Standard compliant 
#
create table value_nodes (v char(4));
create table module_nodes(m char(4));
create table module_arguments(m char(4), v char(4));
create table module_results(m char(4), v char(4));
with recursive
reached_values as 
(
select v from value_nodes where v in ('v3','v7','v9')
union
select module_results.v from module_results, applied_modules
where module_results.m = applied_modules.m
),
applied_modules as
(
select module_nodes.m
from
module_nodes
left join
( 
module_arguments
left join
reached_values
on module_arguments.v = reached_values.v
)
on reached_values.v is null and
module_nodes.m = module_arguments.m
where module_arguments.m is null
)
select * from reached_values;
ERROR HY000: Restrictions imposed on recursive definitions are violated for table 'applied_modules'
drop table value_nodes, module_nodes, module_arguments, module_results;
#
# mdev-12375: query using one of two mutually recursive CTEs
#             whose non-recursive part returns an empty set
#
create table value_nodes (v char(4));
insert into value_nodes values
('v1'), ('v2'), ('v3'), ('v4'), ('v5'), ('v6'), ('v7'), ('v8'), ('v9'),
('v10'), ('v11'), ('v12'), ('v13'), ('v14'), ('v15'), ('v16');
create table module_nodes(m char(4));
insert into module_nodes values
('m1'), ('m2'), ('m3'), ('m4'), ('m5'), ('m6'), ('m7');
create table module_arguments(m char(4), v char(4));
insert into module_arguments values
('m1','v3'), ('m1','v9'),
('m2','v4'), ('m2','v3'), ('m2','v7'),
('m3','v6'),
('m4','v4'), ('m4','v1'),
('m5','v10'), ('m5','v8'), ('m5','v3'),
('m6','v8'), ('m6','v1'),
('m7','v11'), ('m7','v12');
create table module_results(m char(4), v char(4));
insert into module_results values
('m1','v4'),
('m2','v1'), ('m2','v6'),
('m3','v10'),
('m4','v8'),
('m5','v11'), ('m5','v9'),
('m6','v12'), ('m6','v4'),
('m7','v2');
set statement max_recursive_iterations=2, standard_compliant_cte=0 for
with recursive
reached_values as 
(
select v from value_nodes where v in ('v3','v7','v9')
union
select module_results.v from module_results, applied_modules
where module_results.m = applied_modules.m
),
applied_modules as
(
select * from module_nodes where 1=0
union
select module_nodes.m
from
module_nodes
left join
( 
module_arguments
left join
reached_values
on module_arguments.v = reached_values.v
)
on reached_values.v is null and
module_nodes.m = module_arguments.m
where module_arguments.m is null
)
select * from applied_modules;
m
m1
m2
drop table value_nodes, module_nodes, module_arguments, module_results;
#
# mdev-12519: recursive references in subqueries 
#             
create table t1 (lp char(4) not null, rp char(4) not null);
insert into t1 values
('p1','p2'), ('p2','p3'), ('p3','p4'), ('p4','p5'),
('p2','p7'), ('p7','p8'), ('p8','p3'), ('p8','p4');
set standard_compliant_cte=0;
with recursive
reachables(p) as 
( 
select lp from t1 where lp = 'p1'
   union 
select t1.rp from reachables, t1 
where t1.lp = reachables.p
)
select * from reachables;
p
p1
p2
p3
p7
p4
p8
p5
with recursive 
reachables(p) as
(
select lp from t1 where lp = 'p1'
   union 
select t1.rp from reachables, t1 
where 'p3' not in (select * from reachables) and
t1.lp = reachables.p
)
select * from reachables;
p
p1
p2
p3
p7
with recursive 
reachables(p) as
(
select lp from t1 where lp = 'p1'
   union 
select t1.rp from reachables, t1 
where 'p3' not in (select p from reachables where p <= 'p5'
                         union
select p from reachables where p > 'p5') and
t1.lp = reachables.p
)
select * from reachables;
p
p1
p2
p3
p7
prepare stmt from "
with recursive 
reachables(p) as
(
   select lp from t1 where lp = 'p1'
   union 
   select t1.rp from reachables, t1 
      where 'p3' not in (select p from reachables where p <= 'p5'
                         union
                         select p from reachables where p > 'p5') and
                 t1.lp = reachables.p
)
select * from reachables;
";
execute stmt;
p
p1
p2
p3
p7
execute stmt;
p
p1
p2
p3
p7
deallocate prepare stmt;
drop table t1;
create table objects(v char(4) not null);
insert into objects values
('v1'), ('v2'), ('v3'), ('v4'), ('v5'),
('v6'), ('v7'), ('v8'), ('v9'), ('v10');
create table modules(m char(4) not null);
insert into modules values
('m1'), ('m2'), ('m3'), ('m4');
create table module_arguments(m char(4) not null, v char(4) not null);
insert into module_arguments values
('m1','v3'), ('m1','v9'),
('m2','v4'), ('m2','v7'),
('m3','v6'), ('m4','v2');
create table module_results(m char(4) not null, v char(4) not null);
insert into module_results values
('m1','v4'),
('m2','v1'), ('m2','v6'),
('m3','v10'), ('m4','v7');
set standard_compliant_cte=0;
with recursive
reached_objects as 
(
select v, 'init' as m from objects where v in ('v3','v7','v9')
union
select module_results.v, module_results.m from module_results, applied_modules
where module_results.m = applied_modules.m
),
applied_modules as
(
select * from modules where 1=0
union
select modules.m
from
modules
where
not exists (select * from module_arguments
where module_arguments.m = modules.m and
module_arguments.v not in 
(select v from reached_objects))
)
select * from reached_objects;
v	m
v3	init
v7	init
v9	init
v4	m1
v1	m2
v6	m2
v10	m3
with recursive
reached_objects as 
(
select v, 'init' as m from objects where v in ('v3','v7','v9')
union
select module_results.v, module_results.m from module_results, applied_modules
where module_results.m = applied_modules.m
),
applied_modules as
(
select * from modules where 1=0
union
select modules.m
from
modules
where 
'v6' not in (select v from reached_objects) and
not exists (select * from module_arguments
where module_arguments.m = modules.m and
module_arguments.v not in 
(select v from reached_objects))
)
select * from reached_objects;
v	m
v3	init
v7	init
v9	init
v4	m1
v1	m2
v6	m2
prepare stmt from "
with recursive
reached_objects as 
(
  select v, 'init' as m from objects where v in ('v3','v7','v9')
  union
  select module_results.v, module_results.m from module_results, applied_modules
     where module_results.m = applied_modules.m
),
applied_modules as
(
  select * from modules where 1=0
  union
  select modules.m
  from
    modules
    where 
      'v6' not in (select v from reached_objects) and
      not exists (select * from module_arguments
                    where module_arguments.m = modules.m and
                          module_arguments.v not in 
                          (select v from reached_objects))
)
select * from reached_objects;
";
execute stmt;
v	m
v3	init
v7	init
v9	init
v4	m1
v1	m2
v6	m2
execute stmt;
v	m
v3	init
v7	init
v9	init
v4	m1
v1	m2
v6	m2
deallocate prepare stmt;
drop table objects, modules, module_arguments, module_results;
set standard_compliant_cte=default;
select @@standard_compliant_cte;
@@standard_compliant_cte
1
#
# mdev-12554: impossible where in recursive select 
#             
CREATE TABLE t1 (i int);
INSERT INTO t1 VALUES (1),(2);
WITH RECURSIVE
cte(f) AS ( SELECT i FROM t1 UNION SELECT f FROM t1, cte WHERE 1=0 )
SELECT * FROM cte;
f
1
2
DROP TABLE t1;
#
# mdev-12556: recursive execution uses Aria temporary tables 
#             
CREATE TABLE t (c1 varchar(255), c2 tinytext);
INSERT INTO t VALUES ('a','a'),('b','b'),('c','c'),('d','d');
ANALYZE WITH RECURSIVE cte(f) AS (
SELECT c1 FROM t
UNION
SELECT c1 FROM t, cte
) SELECT COUNT(*) FROM cte;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	4.00	100.00	100.00	
2	DERIVED	t	ALL	NULL	NULL	NULL	NULL	4	4.00	100.00	100.00	
3	RECURSIVE UNION	t	ALL	NULL	NULL	NULL	NULL	4	4.00	100.00	100.00	
3	RECURSIVE UNION	<derived2>	ALL	NULL	NULL	NULL	NULL	4	4.00	100.00	100.00	Using join buffer (flat, BNL join)
NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	0.00	NULL	NULL	
WITH RECURSIVE cte(f) AS (
SELECT c1 FROM t
UNION
SELECT c1 FROM t, cte
) SELECT COUNT(*) FROM cte;
COUNT(*)
4
ANALYZE WITH RECURSIVE cte(f) AS (
SELECT c2 FROM t
UNION
SELECT c2 FROM t, cte
) SELECT COUNT(*) FROM cte;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	4.00	100.00	100.00	
2	DERIVED	t	ALL	NULL	NULL	NULL	NULL	4	4.00	100.00	100.00	
3	RECURSIVE UNION	t	ALL	NULL	NULL	NULL	NULL	4	4.00	100.00	100.00	
3	RECURSIVE UNION	<derived2>	ALL	NULL	NULL	NULL	NULL	4	4.00	100.00	100.00	Using join buffer (flat, BNL join)
NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	0.00	NULL	NULL	
WITH RECURSIVE cte(f) AS (
SELECT c2 FROM t
UNION
SELECT c2 FROM t, cte
) SELECT COUNT(*) FROM cte;
COUNT(*)
4
DROP TABLE t;
#
# mdev-12563: no recursive references on the top level of the CTE spec 
#  
CREATE TABLE t (i int);
INSERT INTO t VALUES (3), (1),(2);
SET standard_compliant_cte=0;
WITH RECURSIVE cte(f) AS (
SELECT i FROM t
UNION
SELECT i FROM t WHERE i NOT IN ( SELECT * FROM cte )
) SELECT * FROM cte;
f
3
1
2
WITH RECURSIVE cte(f) AS (
SELECT i FROM t
UNION
SELECT i FROM t WHERE i NOT IN ( SELECT * FROM cte WHERE i < 2 )
UNION
SELECT i FROM t WHERE i NOT IN ( SELECT * FROM cte WHERE i > 2 )
) SELECT * FROM cte;
f
3
1
2
WITH RECURSIVE cte(f) AS (
SELECT i FROM t
UNION
SELECT i FROM t
WHERE i NOT IN ( SELECT * FROM cte WHERE i < 2
UNION
SELECT * FROM cte WHERE i > 2)
) SELECT * FROM cte;
f
3
1
2
WITH RECURSIVE cte(f) AS (
SELECT i FROM t
UNION
SELECT i FROM t 
WHERE i NOT IN ( SELECT * FROM t
WHERE i IN ( SELECT * FROM cte ) GROUP BY i )
) SELECT * FROM cte;
f
3
1
2
WITH RECURSIVE cte(f) AS (
SELECT i FROM t
UNION
SELECT i FROM t WHERE i NOT IN ( SELECT * FROM cte )
UNION 
SELECT * FROM cte WHERE f > 2
) SELECT * FROM cte;
f
3
1
2
set standard_compliant_cte=default;
DROP TABLE t;
#
# mdev-14184: recursive CTE embedded into CTE with multiple references 
#
WITH
cte1 AS (
SELECT n FROM (
WITH RECURSIVE rec_cte(n) AS (
SELECT 1 as n1
UNION ALL
SELECT n+1 as n2 FROM rec_cte WHERE n < 3
) SELECT n FROM rec_cte
) AS X
),
cte2 as (
SELECT 2 FROM cte1
)
SELECT *
FROM cte1;
n
1
2
3
#
# mdev-14629: a user-defined variable is defined by the recursive CTE
#
set @var=
(
with recursive cte_tab(a) as (
select 1
union
select a+1 from cte_tab
where a<3)
select count(*) from cte_tab
);
select @var;
@var
3
create table t1(a int, b int);
insert into t1 values (3,8),(1,5),(5,7),(7,4),(4,3);
set @var=
(
with recursive summ(a,s) as (
select 1, 0 union
select t1.b, t1.b+summ.s from summ, t1
where summ.a=t1.a)
select s from summ
order by a desc
limit 1
);
select @var;
@var
27
set @var=
(
with recursive
cte_1 as (
select 1
union
select * from cte_2),
cte_2 as (
select * from cte_1
union
select a from t1, cte_2
where t1.a=cte_2.a)
select * from cte_2
limit 1
);
ERROR HY000: Unacceptable mutual recursion with anchored table 'cte_1'
drop table t1;
#
# mdev-14777: crash caused by the same as in mdev-14755
#
CREATE TABLE t1 (i1 int NOT NULL, i2 int);
CREATE TABLE t2 (d1 int NOT NULL PRIMARY KEY);
CREATE TABLE t3 (i int );
insert into t1 select seq,seq from seq_1_to_100000;
insert into t2 select seq from  seq_1000_to_100000;
insert into t3 select seq from seq_1_to_1000;
SELECT *
FROM
(
SELECT *
FROM
(
WITH RECURSIVE rt AS
(
SELECT i2 P, i1 C FROM t1 WHERE i1 IN (SELECT d1 FROM t2)
UNION
SELECT t1.i2 P, rt.C C FROM t1, rt
)
SELECT C,P
FROM ( SELECT P,C FROM rt WHERE NOT EXISTS (SELECT 1 FROM t1) ) Y
) X
WHERE 1 = 1
) K, t3;
C	P	i
drop table t1,t2,t3;
#
# mdev-14879: subquery with recursive reference in WHERE of CTE
#
create table flights
(departure varchar(32),
arrival varchar(32),
carrier varchar(20),
flight_number char(7));
insert into flights values
('Seattle', 'Frankfurt', 'Lufthansa', 'LH 491'),
('Seattle', 'Chicago', 'American', 'AA 2573'),
('Seattle', 'Los Angeles', 'Alaska Air', 'AS 410'),
('Chicago', 'New York', 'American', 'AA 375'),
('Chicago', 'Montreal', 'Air Canada', 'AC 3053'),
('Los Angeles', 'New York', 'Delta', 'DL 1197'),
('Moscow', 'Tokyo', 'Aeroflot', 'SU 264'),
('New York', 'Paris', 'Air France', 'AF 23'),
('Frankfurt', 'Moscow', 'Lufthansa', 'LH 1444'),
('Tokyo', 'Seattle', 'ANA', 'NH 178'),
('Los Angeles', 'Tokyo', 'ANA', 'NH 175'),
('Moscow', 'Los Angeles', 'Aeroflot', 'SU 106'),
('Montreal', 'Paris', 'Air Canada', 'AC 870'),
('Cairo', 'Paris', 'Air France', 'AF 503'),
('New York', 'Seattle', 'American', 'AA 45'),
('Paris', 'Chicago', 'Air France', 'AF 6734');
with recursive destinations (city) as
( select a.arrival from flights a where a.departure='Cairo'
  union
select b.arrival from destinations r, flights b where r.city=b.departure)
select * from destinations;
city
Paris
Chicago
New York
Montreal
Seattle
Frankfurt
Los Angeles
Moscow
Tokyo
set standard_compliant_cte=0;
with recursive destinations (city, legs) as
(
select a.arrival, 1 from flights a where a.departure='Cairo'
  union
select b.arrival, r.legs + 1 from destinations r, flights b
where r.city=b.departure and b.arrival not in (select city from destinations)
)
select * from destinations;
city	legs
Paris	1
Chicago	2
New York	3
Montreal	3
Seattle	4
Frankfurt	5
Los Angeles	5
Moscow	6
Tokyo	6
explain extended with recursive destinations (city, legs) as
(
select a.arrival, 1 from flights a where a.departure='Cairo'
  union
select b.arrival, r.legs + 1 from destinations r, flights b
where r.city=b.departure and b.arrival not in (select city from destinations)
)
select * from destinations;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	16	100.00	
2	DERIVED	a	ALL	NULL	NULL	NULL	NULL	16	100.00	Using where
3	RECURSIVE UNION	b	ALL	NULL	NULL	NULL	NULL	16	100.00	Using where
3	RECURSIVE UNION	<derived2>	ref	key0	key0	35	test.b.departure	2	100.00	
4	DEPENDENT SUBQUERY	<derived2>	ALL	NULL	NULL	NULL	NULL	16	100.00	Using where
NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
Warnings:
Note	1003	with recursive destinations(city,legs) as (/* select#2 */ select `test`.`a`.`arrival` AS `city`,1 AS `legs` from `test`.`flights` `a` where `test`.`a`.`departure` = 'Cairo' union /* select#3 */ select `test`.`b`.`arrival` AS `arrival`,`r`.`legs` + 1 AS `r.legs + 1` from `destinations` `r` join `test`.`flights` `b` where `r`.`city` = `test`.`b`.`departure` and !<in_optimizer>(`test`.`b`.`arrival`,<exists>(/* select#4 */ select `destinations`.`city` from `destinations` where trigcond(`test`.`b`.`arrival` = `destinations`.`city` or `destinations`.`city` is null) having trigcond(`destinations`.`city` is null))))/* select#1 */ select `destinations`.`city` AS `city`,`destinations`.`legs` AS `legs` from `destinations`
set standard_compliant_cte=default;
drop table flights;
#
# MDEV-15162: Setting user variable in recursive CTE
#
SET @c=1;
WITH RECURSIVE cte AS
(SELECT 5
UNION
SELECT @c:=@c+1 FROM cte WHERE @c<3)
SELECT * FROM cte;
5
5
2
3
#
# MDEV-15575: using recursive cte with big_tables enabled
#
set big_tables=1;
with recursive qn as
(select 123 as a union all select 1+a from qn where a<130)
select * from qn;
a
123
124
125
126
127
128
129
130
set big_tables=default;
#
# MDEV-15571: using recursive cte with big_tables enabled
#
create table t1 (a bigint);
insert into t1 values(1);
set big_tables=1;
with recursive qn as
(
select  a from t1
union all
select a*2000 from qn where a<10000000000000000000
)
select * from qn;
ERROR 22003: BIGINT value is out of range in '`qn`.`a` * 2000'
set big_tables=default;
drop table t1;
#
# MDEV-15556: using recursive cte with big_tables enabled
#             when recursive tables are accessed by key
#
SET big_tables=1;
CREATE TABLE t1 (id int, name char(10), leftpar int, rightpar int);
INSERT INTO t1 VALUES
(1, "A", 2, 3), (2, "LA", 4, 5), (4, "LLA", 6, 7),
(6, "LLLA", NULL, NULL), (7, "RLLA", NULL, NULL), (5, "RLA", 8, 9),
(8, "LRLA", NULL, NULL), (9, "RRLA", NULL, NULL), (3, "RA", 10, 11),
(10, "LRA", 12, 13), (11, "RRA", 14, 15), (15, "RRRA", NULL, NULL),
(16, "B", 17, 18), (17, "LB", NULL, NULL), (18, "RB", NULL, NULL);
CREATE TABLE t2 SELECT * FROM t1 ORDER BY rand();
WITH RECURSIVE tree_of_a AS
(SELECT *, cast(id AS char(200)) AS path FROM t2 WHERE name="A"
    UNION ALL
SELECT t2.*, concat(tree_of_a.path,",",t2.id)
FROM t2 JOIN tree_of_a ON t2.id=tree_of_a.leftpar
UNION ALL
SELECT t2.*, concat(tree_of_a.path,",",t2.id)
FROM t2 JOIN tree_of_a ON t2.id=tree_of_a.rightpar)
SELECT * FROM tree_of_a
ORDER BY path;
id	name	leftpar	rightpar	path
1	A	2	3	1
2	LA	4	5	1,2
4	LLA	6	7	1,2,4
6	LLLA	NULL	NULL	1,2,4,6
7	RLLA	NULL	NULL	1,2,4,7
5	RLA	8	9	1,2,5
8	LRLA	NULL	NULL	1,2,5,8
9	RRLA	NULL	NULL	1,2,5,9
3	RA	10	11	1,3
10	LRA	12	13	1,3,10
11	RRA	14	15	1,3,11
15	RRRA	NULL	NULL	1,3,11,15
EXPLAIN WITH RECURSIVE tree_of_a AS
(SELECT *, cast(id AS char(200)) AS path FROM t2 WHERE name="A"
    UNION ALL
SELECT t2.*, concat(tree_of_a.path,",",t2.id)
FROM t2 JOIN tree_of_a ON t2.id=tree_of_a.leftpar
UNION ALL
SELECT t2.*, concat(tree_of_a.path,",",t2.id)
FROM t2 JOIN tree_of_a ON t2.id=tree_of_a.rightpar)
SELECT * FROM tree_of_a
ORDER BY path;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	15	Using filesort
2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	15	Using where
3	RECURSIVE UNION	t2	ALL	NULL	NULL	NULL	NULL	15	Using where
3	RECURSIVE UNION	<derived2>	ref	key0	key0	5	test.t2.id	2	
4	RECURSIVE UNION	t2	ALL	NULL	NULL	NULL	NULL	15	Using where
4	RECURSIVE UNION	<derived2>	ref	key0	key0	5	test.t2.id	2	
NULL	UNION RESULT	<union2,3,4>	ALL	NULL	NULL	NULL	NULL	NULL	
DROP TABLE t1,t2;
SET big_tables=0;
#
# MDEV-15840: recursive tables are accessed by key
#             (the same problem as for MDEV-15556)
#
CREATE TABLE t1 (p1 text,k2 int, p2 text, k1 int);
INSERT INTO t1 select seq, seq, seq, seq from seq_1_to_1000;
CREATE PROCEDURE getNums()
BEGIN
WITH RECURSIVE cte as
(
SELECT * FROM t1
UNION
SELECT c.* FROM t1 c JOIN cte p ON c.p1 = p.p2 AND c.k2 = p.k1
)
SELECT * FROM cte LIMIT 10;
END |
call getNums();
p1	k2	p2	k1
1	1	1	1
2	2	2	2
3	3	3	3
4	4	4	4
5	5	5	5
6	6	6	6
7	7	7	7
8	8	8	8
9	9	9	9
10	10	10	10
DROP PROCEDURE getNums;
DROP TABLE t1;
#
# MDEV-15894: aggregate/winfow functions in non-recorsive part
#
create table t1(b int);
insert into t1 values(10),(20),(10);
with recursive qn as
(select max(b) as a from t1 union
select a from qn)
select * from qn;
a
20
with recursive qn as
(select rank() over (order by b) as a from t1 union
select a from qn)
select * from qn;
a
1
3
drop table t1;
#
# MDEV-16086: tmp table for CTE is created as ARIA tables
#
CREATE TABLE t1 (
Id int(11) not null AUTO_INCREMENT,
Parent varchar(15) not null,
Child varchar(15) not null,
PRIMARY KEY (Id)
) ENGINE = MyISAM;
INSERT INTO t1 (Parent, Child) VALUES
('123', '456'),('456', '789'),('321', '654'),('654', '987');
WITH RECURSIVE cte AS
( SELECT b.Parent,
b.Child,
CAST(CONCAT(b.Child,',') AS CHAR(513)) Path
FROM t1 b
LEFT OUTER JOIN t1 bc ON b.Child = bc.Parent
WHERE bc.Id IS NULL
UNION ALL SELECT c.Parent,
c.Child,
CONCAT(p.Path,c.Child,',') Path
FROM t1 c
INNER JOIN cte p ON c.Child = p.Parent)
SELECT *
FROM cte
ORDER BY Path;
Parent	Child	Path
456	789	789,
123	456	789,456,
654	987	987,
321	654	987,654,
DROP TABLE t1;
#
# MDEV-16212: recursive CTE with global ORDER BY
#
set statement max_recursive_iterations = 2 for
WITH RECURSIVE qn AS (
SELECT 1 FROM dual UNION ALL
SELECT 1 FROM qn
ORDER BY (SELECT * FROM qn))
SELECT count(*) FROM qn;
ERROR 42000: This version of MariaDB doesn't yet support 'global ORDER_BY/LIMIT in recursive CTE spec'
#
# MDEV-15581: mix of ALL and DISTINCT UNION in recursive CTE
#
create table t1(a int);
insert into t1 values(1),(2);
insert into t1 values(1),(2);
set @c=0, @d=0;
WITH RECURSIVE qn AS
(
select 1,0 as col from t1
union distinct
select 1,0 from t1
union all
select 3, 0*(@c:=@c+1) from qn where @c<1
union all
select 3, 0*(@d:=@d+1) from qn where @d<1
)
select * from qn;
ERROR 42000: This version of MariaDB doesn't yet support 'mix of ALL and DISTINCT UNION operations in recursive CTE spec'
drop table t1;
#
# MDEV-16629: function with recursive CTE using a base table
#
CREATE TABLE t1 (id int);
INSERT INTO t1 VALUES (0), (1),(2);
WITH recursive cte AS
(SELECT id FROM t1 UNION SELECT 3 FROM cte)
SELECT count(id) FROM cte;
count(id)
4
CREATE OR REPLACE FUNCTION func() RETURNS int
RETURN
(
WITH recursive cte AS
(SELECT id FROM t1 UNION SELECT 3 FROM cte)
SELECT count(id) FROM cte
);
SELECT func();
func()
4
DROP FUNCTION func;
DROP TABLE t1;
#
# MDEV-16661: function with recursive CTE using no base tables
#             (fixed by the patch for MDEV-16629)
#
CREATE OR REPLACE FUNCTION func() RETURNS int
RETURN
(
WITH RECURSIVE cte AS
(SELECT 1 as id UNION SELECT * FROM cte)
SELECT count(id) FROM cte
);
SELECT func();
func()
1
DROP FUNCTION func;
#
# MDEV-17024: two materialized CTEs using the same recursive CTE
#
create table t1 (id int);
insert into t1 values (1), (2), (3);
with recursive
rcte(a) as
(select 1 union select cast(a+1 as unsigned) from rcte where a < 10),
cte1 as
(select count(*) as c1 from rcte,t1 where a between 3 and 5 and id=a-3),
cte2 as
(select count(*) as c2 from rcte,t1 where a between 7 and 8 and id=a-7)
select * from cte1, cte2;
c1	c2
2	1
explain extended with recursive
rcte(a) as
(select 1 union select cast(a+1 as unsigned) from rcte where a < 10),
cte1 as
(select count(*) as c1 from rcte,t1 where a between 3 and 5 and id=a-3),
cte2 as
(select count(*) as c2 from rcte,t1 where a between 7 and 8 and id=a-7)
select * from cte1, cte2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<derived4>	ALL	NULL	NULL	NULL	NULL	6	100.00	
1	PRIMARY	<derived5>	ALL	NULL	NULL	NULL	NULL	6	100.00	Using join buffer (flat, BNL join)
2	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
3	RECURSIVE UNION	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
4	DERIVED	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
4	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (flat, BNL join)
5	DERIVED	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
5	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (flat, BNL join)
Warnings:
Note	1003	with recursive rcte(a) as (/* select#2 */ select 1 AS `a` union /* select#3 */ select cast(`rcte`.`a` + 1 as unsigned) AS `cast(a+1 as unsigned)` from `rcte` where `rcte`.`a` < 10), cte1 as (/* select#4 */ select count(0) AS `c1` from `rcte` join `test`.`t1` where `rcte`.`a` between 3 and 5 and `test`.`t1`.`id` = `rcte`.`a` - 3), cte2 as (/* select#5 */ select count(0) AS `c2` from `rcte` join `test`.`t1` where `rcte`.`a` between 7 and 8 and `test`.`t1`.`id` = `rcte`.`a` - 7)/* select#1 */ select `cte1`.`c1` AS `c1`,`cte2`.`c2` AS `c2` from `cte1` join `cte2`
prepare stmt from "with recursive
rcte(a) as
(select 1 union select cast(a+1 as unsigned) from rcte where a < 10),
cte1 as
(select count(*) as c1 from rcte,t1 where a between 3 and 5 and id=a-3),
cte2 as
(select count(*) as c2 from rcte,t1 where a between 7 and 8 and id=a-7)
select * from cte1, cte2";
execute stmt;
c1	c2
2	1
execute stmt;
c1	c2
2	1
create table t2 (c1 int, c2 int);
create procedure p() insert into t2 with recursive
rcte(a) as
(select 1 union select cast(a+1 as unsigned) from rcte where a < 10),
cte1 as
(select count(*) as c1 from rcte,t1 where a between 3 and 5 and id=a-3),
cte2 as
(select count(*) as c2 from rcte,t1 where a between 7 and 8 and id=a-7)
select * from cte1, cte2;
call p();
select * from t2;
c1	c2
2	1
with recursive
rcte(a) as
(select 1 union select cast(a+1 as unsigned) from rcte where a < 10),
cte1 as
(select count(*) as c1 from rcte,t1 where a between 3 and 5 and id=a-3),
cte2 as
(select count(*) as c2 from rcte,t1 where a between 7 and 8 and id=a-7)
select * from cte1;
c1
2
with recursive
rcte(a) as
(select 1 union select cast(a+1 as unsigned) from rcte where a < 10),
cte1 as
(select count(*) as c1 from t1),
cte2 as
(select count(*) as c2 from t2)
select * from cte1,cte2;
c1	c2
3	1
with recursive
rcte(a) as
(select 1 union select cast(a+1 as unsigned) from rcte where a < 10),
cte1 as
(select count(*) as c1 from rcte,t1 where a between 3 and 5 and id=a-3),
cte2 as
(select count(*) as c2 from rcte,t1 where a between 7 and 8 and id=a-7)
select * from cte1, cte2 where cte1.c1 = 3;
c1	c2
with recursive
rcte(a) as
(select 1 union select cast(a+1 as unsigned) from rcte where a < 10),
cte1 as
(select count(*) as c1 from rcte,t1 where a between 3 and 5 and id=a-3),
cte2 as
(select count(*) as c2 from rcte,t1 where a between 7 and 8 and id=a-7)
select * from cte2, cte1;
c2	c1
1	2
explain extended with recursive
rcte(a) as
(select 1 union select cast(a+1 as unsigned) from rcte where a < 10),
cte1 as
(select count(*) as c1 from rcte,t1 where a between 3 and 5 and id=a-3),
cte2 as
(select count(*) as c2 from rcte,t1 where a between 7 and 8 and id=a-7)
select * from cte2, cte1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<derived5>	ALL	NULL	NULL	NULL	NULL	6	100.00	
1	PRIMARY	<derived4>	ALL	NULL	NULL	NULL	NULL	6	100.00	Using join buffer (flat, BNL join)
2	DERIVED	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
3	RECURSIVE UNION	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
5	DERIVED	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
5	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (flat, BNL join)
4	DERIVED	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
4	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (flat, BNL join)
Warnings:
Note	1003	with recursive rcte(a) as (/* select#2 */ select 1 AS `a` union /* select#3 */ select cast(`rcte`.`a` + 1 as unsigned) AS `cast(a+1 as unsigned)` from `rcte` where `rcte`.`a` < 10), cte1 as (/* select#4 */ select count(0) AS `c1` from `rcte` join `test`.`t1` where `rcte`.`a` between 3 and 5 and `test`.`t1`.`id` = `rcte`.`a` - 3), cte2 as (/* select#5 */ select count(0) AS `c2` from `rcte` join `test`.`t1` where `rcte`.`a` between 7 and 8 and `test`.`t1`.`id` = `rcte`.`a` - 7)/* select#1 */ select `cte2`.`c2` AS `c2`,`cte1`.`c1` AS `c1` from `cte2` join `cte1`
prepare stmt from "with recursive
rcte(a) as
(select 1 union select cast(a+1 as unsigned) from rcte where a < 10),
cte1 as
(select count(*) as c1 from rcte,t1 where a between 3 and 5 and id=a-3),
cte2 as
(select count(*) as c2 from rcte,t1 where a between 7 and 8 and id=a-7)
select * from cte2, cte1";
execute stmt;
c2	c1
1	2
execute stmt;
c2	c1
1	2
drop procedure p;
drop table t2;
create table t2 (c1 int, c2 int);
create procedure p() insert into t2 with recursive
rcte(a) as
(select 1 union select cast(a+1 as unsigned) from rcte where a < 10),
cte1 as
(select count(*) as c1 from rcte,t1 where a between 3 and 5 and id=a-3),
cte2 as
(select count(*) as c2 from rcte,t1 where a between 7 and 8 and id=a-7)
select * from cte2, cte1;
call p();
select * from t2;
c1	c2
1	2
drop procedure p;
drop table t1,t2;
#
# MDEV-17201: recursive part with LIMIT
#
CREATE TABLE purchases (
id int unsigned NOT NULL AUTO_INCREMENT,
pdate date NOT NULL,
quantity int unsigned NOT NULL,
p_id int unsigned NOT NULL,
PRIMARY KEY (id)
);
INSERT INTO purchases(pdate, quantity, p_id) VALUES
('2014-11-01',5 ,1),('2014-11-03', 3 ,1),
('2014-11-01',2 ,2),('2014-11-03', 4 ,2);
CREATE TABLE expired (
edate date NOT NULL,
quantity int unsigned NOT NULL,
p_id int unsigned NOT NULL,
PRIMARY KEY (edate,p_id)
);
INSERT INTO expired VALUES ('2014-11-12', 5 ,1),('2014-11-08', 1 ,2);
WITH RECURSIVE expired_map AS (
SELECT edate AS expired_date,
CAST(NULL AS date) AS purchase_date,
0 AS quantity,
e.p_id,
(SELECT MAX(id)+1 FROM purchases p
WHERE pdate <= edate AND p.p_id =p_id) AS purchase_processed,
quantity AS unresolved
FROM expired e
UNION
( SELECT expired_date,
pdate,
IF(p.quantity < m.unresolved, p.quantity, m.unresolved),
p.p_id,
p.id,
IF(p.quantity < m.unresolved, m.unresolved - p.quantity, 0)
FROM purchases p JOIN expired_map m ON p.p_id = m.p_id
WHERE p.id < m.purchase_processed AND m.unresolved > 0
ORDER BY p.id DESC
LIMIT 1
)
)
SELECT  * FROM expired_map;
expired_date	purchase_date	quantity	p_id	purchase_processed	unresolved
2014-11-12	NULL	0	1	5	5
2014-11-08	NULL	0	2	5	1
2014-11-08	2014-11-03	1	2	4	0
DROP TABLE purchases, expired;
#
# MDEV-17635: Two recursive CTEs, the second using the first
#
WITH RECURSIVE
x AS (SELECT 0 as k UNION ALL SELECT k + 1 FROM x WHERE k < 1),
z AS
( SELECT  k1 AS cx, k2 AS cy, k1, k2
FROM (SELECT k  AS k1 FROM x) x1 JOIN (SELECT k  AS k2 FROM x) y1
UNION
SELECT 1,1,1,1 FROM z)
SELECT * FROM z;
cx	cy	k1	k2
0	0	0	0
1	0	1	0
0	1	0	1
1	1	1	1
# https://wiki.postgresql.org/wiki/Mandelbrot_set:
WITH RECURSIVE x(i) AS (
SELECT CAST(0 AS DECIMAL(13, 10))
UNION ALL
SELECT i + 1
FROM x
WHERE i < 101
),
Z(Ix, Iy, Cx, Cy, X, Y, I) AS (
SELECT Ix, Iy, X, Y, X, Y, 0
FROM (SELECT CAST(-2.2 + 0.031 * i AS DECIMAL(13, 10)) AS X,
i AS Ix FROM x) AS xgen
CROSS JOIN (
SELECT CAST(-1.5 + 0.031 * i AS DECIMAL(13, 10)) AS Y,
i AS iY FROM x
) AS ygen
UNION ALL
SELECT Ix, Iy, Cx, Cy,
CAST(X * X - Y * Y + Cx AS DECIMAL(13, 10)) AS X,
CAST(Y * X * 2 + Cy AS DECIMAL(13, 10)), I + 1
FROM Z
WHERE X * X + Y * Y < 16.0
AND I < 27
),
Zt (Ix, Iy, I) AS (
SELECT Ix, Iy, MAX(I) AS I
FROM Z
GROUP BY Iy, Ix
ORDER BY Iy, Ix
)
SELECT GROUP_CONCAT(
SUBSTRING(
' .,,,-----++++%%%%@@@@#### ',
GREATEST(I, 1),
1
) ORDER BY Ix SEPARATOR ''
       ) AS 'Mandelbrot Set'
  FROM Zt
GROUP BY Iy
ORDER BY Iy;
Mandelbrot Set
             ....................................................................................     
            .......................................................................................   
           .........................................................................................  
          ........................................................................................... 
        ....................................................,,,,,,,,,.................................
       ................................................,,,,,,,,,,,,,,,,,,.............................
      ..............................................,,,,,,,,,,,,,,,,,,,,,,,,..........................
     ............................................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,........................
     ..........................................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,......................
    .........................................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,....................
   ........................................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,...................
  .......................................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,.................
 .......................................,,,,,,,,,,,,,,,,,,,,,,,,--,,,,,,,,,,,,,,,,,,,,................
......................................,,,,,,,,,,,,,,,,,,,,,,,,,,-+--,,,,,,,,,,,,,,,,,,,...............
....................................,,,,,,,,,,,,,,,,,,,,,,,,,,,,-----,,,,,,,,,,,,,,,,,,,..............
...................................,,,,,,,,,,,,,,,,,,,,,,,,,,,,--- -----,,,,,,,,,,,,,,,,,.............
.................................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,---++--++,,,,,,,,,,,,,,,,,,............
................................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,-----%++---,,,,,,,,,,,,,,,,,............
..............................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,-----+%----,,,,,,,,,,,,,,,,,,...........
.............................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,----- %%+----,,,,,,,,,,,,,,,,,,..........
...........................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,---%-+%   ----,,,,,,,,,,,,,,,,,,,.........
..........................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,---+ +##  %+%---,,,,,,,,,,,,,,,,,,.........
........................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,-----#      # +---,,,,,,,,,,,,,,,,,,........
.......................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,-------%       %-----,,,,,,,,,,,,,,,,,........
.....................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,---------+         ------,,,,,,,,,,,,,,,,,.......
....................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,-----------+@       +-----------,,,,,,,,,,,,.......
..................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,----@-------++       ++-----------,,,,,,,,,,,,......
.................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,--+@% ---+ +@%%@     %%+@+@%------+-,,,,,,,,,,,......
................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,----  # ++%               % @-----++--,,,,,,,,,,,.....
..............,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,----+    %                  %%++ %+%@-,,,,,,,,,,,.....
.............,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,-----+#                       #%    ++-,,,,,,,,,,,,....
............,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,------+                             @---,,,,,,,,,,,,....
..........,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,-------++%                             ---,,,,,,,,,,,,....
.........,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,--------+ +                             %+---,,,,,,,,,,,,,...
........,,,,,,,,,,,,,,,,,,,,,--------------------@                                +----,,,,,,,,,,,,...
.......,,,,,,,,,,,,,,,,,,,,,,- +-----------------+                                 ----,,,,,,,,,,,,...
.......,,,,,,,,,,,,,,,,,,,,,--++------+---------+%                                 +++--,,,,,,,,,,,,..
......,,,,,,,,,,,,,,,,,,,,,,--%+-----++---------                                     #+-,,,,,,,,,,,,..
.....,,,,,,,,,,,,,,,,,,,,,,----#%++--+@ -+-----+%                                     --,,,,,,,,,,,,..
.....,,,,,,,,,,,,,,,,,,,,,,-----+## ++@ + +----%                                    +--,,,,,,,,,,,,,..
....,,,,,,,,,,,,,,,,,,,,,,------+@  @     @@++++#                                   +--,,,,,,,,,,,,,..
....,,,,,,,,,,,,,,,,,,,,,-------%           #++%                                      -,,,,,,,,,,,,,..
...,,,,,,,,,,,,,,,,,,,,,------++%#           %%@                                     %-,,,,,,,,,,,,,,.
...,,,,,,,,,,,,,,,,,,,--------+               %                                     +--,,,,,,,,,,,,,,.
...,,,,,,,,,,,,,,,,,,-----+--++@              #                                      --,,,,,,,,,,,,,,.
..,,,,,,,,,,,,,,,,,-------%+++%                                                    @--,,,,,,,,,,,,,,,.
..,,,,,,,,,,,-------------+ @#@                                                    ---,,,,,,,,,,,,,,,.
..,,,,,,,,,---@--------@-+%                                                       +---,,,,,,,,,,,,,,,.
..,,,,,------- +-++++-+%%%                                                       +----,,,,,,,,,,,,,,,.
..,,,,,,------%--------++%                                                       +----,,,,,,,,,,,,,,,.
..,,,,,,,,,,--+----------++#                                                       ---,,,,,,,,,,,,,,,.
..,,,,,,,,,,,,------------+@@@%                                                    +--,,,,,,,,,,,,,,,.
..,,,,,,,,,,,,,,,,,------- +++%                                                    %--,,,,,,,,,,,,,,,.
...,,,,,,,,,,,,,,,,,,---------+@              @                                      --,,,,,,,,,,,,,,.
...,,,,,,,,,,,,,,,,,,,,------- #              %@                                    +--,,,,,,,,,,,,,,.
...,,,,,,,,,,,,,,,,,,,,,-------++@           %+                                      %-,,,,,,,,,,,,,,.
....,,,,,,,,,,,,,,,,,,,,,-------            %++%                                     %-,,,,,,,,,,,,,..
....,,,,,,,,,,,,,,,,,,,,,,------+#  %#   #@ ++++                                    +--,,,,,,,,,,,,,..
.....,,,,,,,,,,,,,,,,,,,,,,-----+ %%++% +@+----+                                    +--,,,,,,,,,,,,,..
.....,,,,,,,,,,,,,,,,,,,,,,,---%+++--+#+--------%                                    #--,,,,,,,,,,,,..
......,,,,,,,,,,,,,,,,,,,,,,--++-----%%---------                                    @#--,,,,,,,,,,,,..
.......,,,,,,,,,,,,,,,,,,,,,---------------------+@                                +-++,,,,,,,,,,,,...
........,,,,,,,,,,,,,,,,,,,,,--------------------+                                 ----,,,,,,,,,,,,...
.........,,,,,,,,,,,,,,,,,,,,----,,,-------------                                #+----,,,,,,,,,,,,...
..........,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,-------+ +                              +---,,,,,,,,,,,,,...
...........,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,--------+%#                           #---,,,,,,,,,,,,....
............,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,------+#                        @   @---,,,,,,,,,,,,....
.............,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,-----+#                        +    @--,,,,,,,,,,,,....
..............,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,---+%   %+@                 %+-+ +++%-,,,,,,,,,,,.....
................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,----% %@++              # %  -----++-,,,,,,,,,,,,.....
.................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,-- ++ ---+ + +%@     %++++++------%-,,,,,,,,,,,......
...................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,---- -------++       +------------,,,,,,,,,,,,......
....................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,-----------+%       +--------,,,,,,,,,,,,,,,.......
......................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,--------+#        -----,,,,,,,,,,,,,,,,,,.......
.......................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,-------+       #----,,,,,,,,,,,,,,,,,,........
.........................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,----+%      %#---,,,,,,,,,,,,,,,,,,,........
..........................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,---+%+%@  %+%%--,,,,,,,,,,,,,,,,,,.........
............................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,---+-+%  %----,,,,,,,,,,,,,,,,,,..........
.............................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,-----+%@+---,,,,,,,,,,,,,,,,,,,..........
...............................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,-----+%----,,,,,,,,,,,,,,,,,,...........
................................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,-----%+ +--,,,,,,,,,,,,,,,,,............
..................................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,---++----,,,,,,,,,,,,,,,,,.............
...................................,,,,,,,,,,,,,,,,,,,,,,,,,,,,---@-----,,,,,,,,,,,,,,,,,.............
.....................................,,,,,,,,,,,,,,,,,,,,,,,,,,,-----,,,,,,,,,,,,,,,,,,,..............
 .....................................,,,,,,,,,,,,,,,,,,,,,,,,,,--%,,,,,,,,,,,,,,,,,,,,...............
 .......................................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,.................
  ........................................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,..................
   ........................................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,...................
    .........................................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,....................
     ..........................................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,......................
      ............................................,,,,,,,,,,,,,,,,,,,,,,,,,,,,........................
       .............................................,,,,,,,,,,,,,,,,,,,,,,,,..........................
        ................................................,,,,,,,,,,,,,,,,,.............................
         .....................................................,,,,....................................
          ........................................................................................... 
           .........................................................................................  
            ......................................................................................    
             ....................................................................................     
               .................................................................................      
                ..............................................................................        
                  ...........................................................................         
                   ........................................................................           
#
# MDEV-17871: EXPLAIN for query with not used recursive cte
#
create table t1 (a int);
insert into t1 values (2), (1), (4), (3);
explain extended
with recursive cte as
(select * from t1 where a=1 union select a+1 from cte where a<3)
select * from cte as t;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	4	100.00	
2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
3	RECURSIVE UNION	<derived2>	ALL	NULL	NULL	NULL	NULL	4	100.00	Using where
NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
Warnings:
Note	1003	with recursive cte as (/* select#2 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where `test`.`t1`.`a` = 1 union /* select#3 */ select `cte`.`a` + 1 AS `a+1` from `cte` where `cte`.`a` < 3)/* select#1 */ select `t`.`a` AS `a` from `cte` `t`
with recursive cte as
(select * from t1 where a=1 union select a+1 from cte where a<3)
select * from cte as t;
a
1
2
3
explain extended
with recursive cte as
(select * from t1 where a=1 union select a+1 from cte where a<3)
select * from t1 as t;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	t	ALL	NULL	NULL	NULL	NULL	4	100.00	
Warnings:
Note	1003	with recursive cte as (/* select#2 */ select `*` AS `*` from `test`.`t1` where `a` = 1 union /* select#3 */ select `a` + 1 AS `a+1` from `cte` where `a` < 3)/* select#1 */ select `test`.`t`.`a` AS `a` from `test`.`t1` `t`
with recursive cte as
(select * from t1 where a=1 union select a+1 from cte where a<3)
select * from t1 as t;
a
2
1
4
3
create table t2 ( i1 int, i2 int);
insert into t2 values (1,1),(2,2);
explain
with recursive cte as
( select * from t1 union select s1.* from t1 as s1, cte where s1.i1 = cte.i2 )
select * from t1 as t;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t	ALL	NULL	NULL	NULL	NULL	4	
drop table t1,t2;
#
# MDEV-22042: ANALYZE of query using stored function and recursive CTE
#
create table t1 (a1 varchar(20),a2 varchar(20)) engine=myisam;
insert into t1 values (1,1),(2,2),(3,3);
create table t2 (
a2 varchar(20) primary key, b1 varchar(20), key (b1)
) engine=myisam;
insert into t2 values (1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7);
insert into t2 values (11,11),(12,12),(13,13),(14,14),(15,15),(16,16),(17,17);
create  function f1(id varchar(20)) returns varchar(50)
begin
declare res  varchar (50);
select a2 into res from t2 where a2=id and b1=1 limit 1;
return res;
end$$
select fv
from (select t1.a1, f1(t1.a2) fv from t1) dt
where (dt.a1) in (with recursive cte as (select a2 from t2 where a2='2'
   union select tt2.a2 from t2 tt2 join cte on tt2.b1=cte.a2)
select a2 from cte);
fv
NULL
explain select fv
from (select t1.a1, f1(t1.a2) fv from t1) dt
where (dt.a1) in (with recursive cte as (select a2 from t2 where a2='2'
   union select tt2.a2 from t2 tt2 join cte on tt2.b1=cte.a2)
select a2 from cte);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	
1	PRIMARY	<subquery5>	eq_ref	distinct_key	distinct_key	23	func	1	
5	MATERIALIZED	<derived3>	ALL	NULL	NULL	NULL	NULL	2	
3	DERIVED	t2	const	PRIMARY	PRIMARY	22	const	1	Using index
4	RECURSIVE UNION	<derived3>	ALL	NULL	NULL	NULL	NULL	2	Using where
4	RECURSIVE UNION	tt2	ref	b1	b1	23	cte.a2	2	
NULL	UNION RESULT	<union3,4>	ALL	NULL	NULL	NULL	NULL	NULL	
analyze format=json select fv
from (select t1.a1, f1(t1.a2) fv from t1) dt
where (dt.a1) in (with recursive cte as (select a2 from t2 where a2='2'
   union select tt2.a2 from t2 tt2 join cte on tt2.b1=cte.a2)
select a2 from cte);
ANALYZE
{
  "query_block": {
    "select_id": 1,
    "r_loops": 1,
    "r_total_time_ms": "REPLACED",
    "const_condition": "1",
    "table": {
      "table_name": "t1",
      "access_type": "ALL",
      "r_loops": 1,
      "rows": 3,
      "r_rows": 3,
      "r_total_time_ms": "REPLACED",
      "filtered": 100,
      "r_filtered": 100
    },
    "table": {
      "table_name": "<subquery5>",
      "access_type": "eq_ref",
      "possible_keys": ["distinct_key"],
      "key": "distinct_key",
      "key_length": "23",
      "used_key_parts": ["a2"],
      "ref": ["func"],
      "r_loops": 3,
      "rows": 1,
      "r_rows": 0.3333,
      "r_total_time_ms": "REPLACED",
      "filtered": 100,
      "r_filtered": 100,
      "materialized": {
        "unique": 1,
        "query_block": {
          "select_id": 5,
          "table": {
            "table_name": "<derived3>",
            "access_type": "ALL",
            "r_loops": 1,
            "rows": 2,
            "r_rows": 1,
            "r_total_time_ms": "REPLACED",
            "filtered": 100,
            "r_filtered": 100,
            "materialized": {
              "query_block": {
                "recursive_union": {
                  "table_name": "<union3,4>",
                  "access_type": "ALL",
                  "r_loops": 0,
                  "r_rows": null,
                  "query_specifications": [
                    {
                      "query_block": {
                        "select_id": 3,
                        "r_loops": 1,
                        "r_total_time_ms": "REPLACED",
                        "table": {
                          "table_name": "t2",
                          "access_type": "const",
                          "possible_keys": ["PRIMARY"],
                          "key": "PRIMARY",
                          "key_length": "22",
                          "used_key_parts": ["a2"],
                          "ref": ["const"],
                          "r_loops": 0,
                          "rows": 1,
                          "r_rows": null,
                          "filtered": 100,
                          "r_filtered": null,
                          "using_index": true
                        }
                      }
                    },
                    {
                      "query_block": {
                        "select_id": 4,
                        "operation": "UNION",
                        "r_loops": 1,
                        "r_total_time_ms": "REPLACED",
                        "table": {
                          "table_name": "<derived3>",
                          "access_type": "ALL",
                          "r_loops": 1,
                          "rows": 2,
                          "r_rows": 1,
                          "r_total_time_ms": "REPLACED",
                          "filtered": 100,
                          "r_filtered": 100,
                          "attached_condition": "cte.a2 is not null"
                        },
                        "table": {
                          "table_name": "tt2",
                          "access_type": "ref",
                          "possible_keys": ["b1"],
                          "key": "b1",
                          "key_length": "23",
                          "used_key_parts": ["b1"],
                          "ref": ["cte.a2"],
                          "r_loops": 1,
                          "rows": 2,
                          "r_rows": 1,
                          "r_total_time_ms": "REPLACED",
                          "filtered": 100,
                          "r_filtered": 100
                        }
                      }
                    }
                  ]
                }
              }
            }
          }
        }
      }
    }
  }
}
drop function f1;
drop table t1,t2;
#
# MDEV-22748: two materialized CTEs using the same recursive CTE
# (see also test case for MDEV-17024)
#
CREATE TABLE t1 (YEAR int(4), d1 date , d2 date) ;
INSERT INTO t1 VALUES (2018,'2018-01-01','2018-09-20');
CREATE TABLE t2 (id int, tm date);
INSERT INTO t2 VALUES (1,'2018-08-30'),(2,'2018-08-30'),(3,'2018-08-30');
CREATE TABLE t3 (id int, tm date);
INSERT INTO t3 VALUES (1,'2018-08-30'),(2,'2018-08-30');
WITH RECURSIVE
cte AS
(SELECT  YEAR(t1.d1) AS YEAR, t1.d1 AS st, t1.d1 + INTERVAL 1 MONTH AS fn
FROM t1
UNION ALL
SELECT YEAR(cte.st + INTERVAL 1 MONTH),
cte.st + INTERVAL 1 MONTH,  t1.d2 + INTERVAL 1 DAY
FROM cte JOIN t1
WHERE cte.st + INTERVAL 1 MONTH < t1.d2 ),
cte2 AS (SELECT YEAR, COUNT(*)
FROM cte JOIN t2 ON t2.tm BETWEEN cte.st AND cte.fn),
cte3 AS (SELECT YEAR, COUNT(*)
FROM cte JOIN t3 ON t3.tm BETWEEN cte.st AND cte.fn)
SELECT t1.* FROM t1 JOIN cte2 USING (YEAR) JOIN cte3 USING (YEAR);
YEAR	d1	d2
2018	2018-01-01	2018-09-20
EXPLAIN EXTENDED WITH RECURSIVE
cte AS
(SELECT  YEAR(t1.d1) AS YEAR, t1.d1 AS st, t1.d1 + INTERVAL 1 MONTH AS fn
FROM t1
UNION ALL
SELECT YEAR(cte.st + INTERVAL 1 MONTH),
cte.st + INTERVAL 1 MONTH,  t1.d2 + INTERVAL 1 DAY
FROM cte JOIN t1
WHERE cte.st + INTERVAL 1 MONTH < t1.d2 ),
cte2 AS (SELECT YEAR, COUNT(*)
FROM cte JOIN t2 ON t2.tm BETWEEN cte.st AND cte.fn),
cte3 AS (SELECT YEAR, COUNT(*)
FROM cte JOIN t3 ON t3.tm BETWEEN cte.st AND cte.fn)
SELECT t1.* FROM t1 JOIN cte2 USING (YEAR) JOIN cte3 USING (YEAR);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	1	100.00	
1	PRIMARY	<derived5>	ref	key0	key0	5	const	0	0.00	
1	PRIMARY	<derived4>	ref	key0	key0	5	const	0	0.00	
2	DERIVED	t1	system	NULL	NULL	NULL	NULL	1	100.00	
3	RECURSIVE UNION	t1	system	NULL	NULL	NULL	NULL	1	100.00	
3	RECURSIVE UNION	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	NULL	
4	DERIVED	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	
4	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (flat, BNL join)
5	DERIVED	<derived2>	ALL	NULL	NULL	NULL	NULL	2	100.00	
5	DERIVED	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer (flat, BNL join)
Warnings:
Note	1003	with recursive cte as (/* select#2 */ select year(`test`.`t1`.`d1`) AS `YEAR`,`test`.`t1`.`d1` AS `st`,`test`.`t1`.`d1` + interval 1 month AS `fn` from `test`.`t1` union all /* select#3 */ select year(`cte`.`st` + interval 1 month) AS `YEAR(cte.st + INTERVAL 1 MONTH)`,`cte`.`st` + interval 1 month AS `cte.st + INTERVAL 1 MONTH`,`test`.`t1`.`d2` + interval 1 day AS `t1.d2 + INTERVAL 1 DAY` from `cte` join `test`.`t1` where `cte`.`st` + interval 1 month < `test`.`t1`.`d2`), cte2 as (/* select#4 */ select `cte`.`YEAR` AS `YEAR`,count(0) AS `COUNT(*)` from `cte` join `test`.`t2` where `test`.`t2`.`tm` between `cte`.`st` and `cte`.`fn`), cte3 as (/* select#5 */ select `cte`.`YEAR` AS `YEAR`,count(0) AS `COUNT(*)` from `cte` join `test`.`t3` where `test`.`t3`.`tm` between `cte`.`st` and `cte`.`fn`)/* select#1 */ select 2018 AS `YEAR`,'2018-01-01' AS `d1`,'2018-09-20' AS `d2` from `cte2` join `cte3` where `cte3`.`YEAR` = 2018 and `cte2`.`YEAR` = 2018
PREPARE stmt FROM "WITH RECURSIVE
cte AS
(SELECT  YEAR(t1.d1) AS YEAR, t1.d1 AS st, t1.d1 + INTERVAL 1 MONTH AS fn
FROM t1
UNION ALL
SELECT YEAR(cte.st + INTERVAL 1 MONTH),
cte.st + INTERVAL 1 MONTH,  t1.d2 + INTERVAL 1 DAY
FROM cte JOIN t1
WHERE cte.st + INTERVAL 1 MONTH < t1.d2 ),
cte2 AS (SELECT YEAR, COUNT(*)
FROM cte JOIN t2 ON t2.tm BETWEEN cte.st AND cte.fn),
cte3 AS (SELECT YEAR, COUNT(*)
FROM cte JOIN t3 ON t3.tm BETWEEN cte.st AND cte.fn)
SELECT t1.* FROM t1 JOIN cte2 USING (YEAR) JOIN cte3 USING (YEAR)";
EXECUTE stmt;
YEAR	d1	d2
2018	2018-01-01	2018-09-20
EXECUTE stmt;
YEAR	d1	d2
2018	2018-01-01	2018-09-20
CREATE TABLE t4 (YEAR int(4), d1 date , d2 date);
CREATE PROCEDURE p() INSERT INTO t4 WITH RECURSIVE
cte AS
(SELECT  YEAR(t1.d1) AS YEAR, t1.d1 AS st, t1.d1 + INTERVAL 1 MONTH AS fn
FROM t1
UNION ALL
SELECT YEAR(cte.st + INTERVAL 1 MONTH),
cte.st + INTERVAL 1 MONTH,  t1.d2 + INTERVAL 1 DAY
FROM cte JOIN t1
WHERE cte.st + INTERVAL 1 MONTH < t1.d2 ),
cte2 AS (SELECT YEAR, COUNT(*)
FROM cte JOIN t2 ON t2.tm BETWEEN cte.st AND cte.fn),
cte3 AS (SELECT YEAR, COUNT(*)
FROM cte JOIN t3 ON t3.tm BETWEEN cte.st AND cte.fn)
SELECT t1.* FROM t1 JOIN cte2 USING (YEAR) JOIN cte3 USING (YEAR);
CALL p();
SELECT * FROM t4;
YEAR	d1	d2
2018	2018-01-01	2018-09-20
DROP PROCEDURE p;
DROP TABLE t1,t2,t3,t4;
#
# MDEV-23619: recursive CTE used only in the second operand of UNION
#
create table t1 (
a bigint(10) not null auto_increment,
b int(5) not null,
c bigint(10) default null,
primary key (a)
) engine myisam;
insert into t1 values
(1,3,12), (2,7,15), (3,1,3), (4,3,1);
explain with recursive r_cte as
( select * from t1 as s
union
select t1.* from t1, r_cte as r where t1.c = r.a )
select 0 as b FROM dual union all select b FROM r_cte as t;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
2	DERIVED	s	ALL	NULL	NULL	NULL	NULL	4	
3	RECURSIVE UNION	t1	ALL	NULL	NULL	NULL	NULL	4	Using where
3	RECURSIVE UNION	<derived2>	ref	key0	key0	9	test.t1.c	2	
NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	
4	UNION	<derived2>	ALL	NULL	NULL	NULL	NULL	4	
with recursive r_cte as
( select * from t1 as s
union
select t1.* from t1, r_cte as r where t1.c = r.a )
select 0 as b FROM dual union all select b FROM r_cte as t;
b
0
3
7
1
3
analyze format=json with recursive r_cte as
( select * from t1 as s
union
select t1.* from t1, r_cte as r where t1.c = r.a )
select 0 as b FROM dual union all select b FROM r_cte as t;
ANALYZE
{
  "query_block": {
    "union_result": {
      "table_name": "<union1,4>",
      "access_type": "ALL",
      "r_loops": 0,
      "r_rows": null,
      "query_specifications": [
        {
          "query_block": {
            "select_id": 1,
            "table": {
              "message": "No tables used"
            }
          }
        },
        {
          "query_block": {
            "select_id": 4,
            "operation": "UNION",
            "r_loops": 1,
            "r_total_time_ms": "REPLACED",
            "table": {
              "table_name": "<derived2>",
              "access_type": "ALL",
              "r_loops": 1,
              "rows": 4,
              "r_rows": 4,
              "r_total_time_ms": "REPLACED",
              "filtered": 100,
              "r_filtered": 100,
              "materialized": {
                "query_block": {
                  "recursive_union": {
                    "table_name": "<union2,3>",
                    "access_type": "ALL",
                    "r_loops": 0,
                    "r_rows": null,
                    "query_specifications": [
                      {
                        "query_block": {
                          "select_id": 2,
                          "r_loops": 1,
                          "r_total_time_ms": "REPLACED",
                          "table": {
                            "table_name": "s",
                            "access_type": "ALL",
                            "r_loops": 1,
                            "rows": 4,
                            "r_rows": 4,
                            "r_total_time_ms": "REPLACED",
                            "filtered": 100,
                            "r_filtered": 100
                          }
                        }
                      },
                      {
                        "query_block": {
                          "select_id": 3,
                          "operation": "UNION",
                          "r_loops": 1,
                          "r_total_time_ms": "REPLACED",
                          "table": {
                            "table_name": "t1",
                            "access_type": "ALL",
                            "r_loops": 1,
                            "rows": 4,
                            "r_rows": 4,
                            "r_total_time_ms": "REPLACED",
                            "filtered": 100,
                            "r_filtered": 100,
                            "attached_condition": "t1.c is not null"
                          },
                          "table": {
                            "table_name": "<derived2>",
                            "access_type": "ref",
                            "possible_keys": ["key0"],
                            "key": "key0",
                            "key_length": "9",
                            "used_key_parts": ["a"],
                            "ref": ["test.t1.c"],
                            "r_loops": 4,
                            "rows": 2,
                            "r_rows": 0.5,
                            "r_total_time_ms": "REPLACED",
                            "filtered": 100,
                            "r_filtered": 100
                          }
                        }
                      }
                    ]
                  }
                }
              }
            }
          }
        }
      ]
    }
  }
}
prepare stmt from "with recursive r_cte as
( select * from t1 as s
union
select t1.* from t1, r_cte as r where t1.c = r.a )
select 0 as b FROM dual union all select b FROM r_cte as t";
execute stmt;
b
0
3
7
1
3
execute stmt;
b
0
3
7
1
3
deallocate prepare stmt;
#checking hanging cte that uses a recursive cte
explain with h_cte as
( with recursive r_cte as
( select * from t1 as s
union
select t1.* from t1, r_cte as r where t1.c = r.a )
select 0 as b FROM dual union all select b FROM r_cte as t)
select * from t1 as tt;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	tt	ALL	NULL	NULL	NULL	NULL	4	
with h_cte as
( with recursive r_cte as
( select * from t1 as s
union
select t1.* from t1, r_cte as r where t1.c = r.a )
select 0 as b FROM dual union all select b FROM r_cte as t)
select * from t1 as tt;
a	b	c
1	3	12
2	7	15
3	1	3
4	3	1
analyze format=json with h_cte as
( with recursive r_cte as
( select * from t1 as s
union
select t1.* from t1, r_cte as r where t1.c = r.a )
select 0 as b FROM dual union all select b FROM r_cte as t)
select * from t1 as tt;
ANALYZE
{
  "query_block": {
    "select_id": 1,
    "r_loops": 1,
    "r_total_time_ms": "REPLACED",
    "table": {
      "table_name": "tt",
      "access_type": "ALL",
      "r_loops": 1,
      "rows": 4,
      "r_rows": 4,
      "r_total_time_ms": "REPLACED",
      "filtered": 100,
      "r_filtered": 100
    }
  }
}
prepare stmt from "with h_cte as
( with recursive r_cte as
( select * from t1 as s
union
select t1.* from t1, r_cte as r where t1.c = r.a )
select 0 as b FROM dual union all select b FROM r_cte as t)
select * from t1 as tt";
execute stmt;
a	b	c
1	3	12
2	7	15
3	1	3
4	3	1
execute stmt;
a	b	c
1	3	12
2	7	15
3	1	3
4	3	1
deallocate prepare stmt;
drop table t1;
#
# MDEV-24019: query with recursive CTE when no default database is set
#
drop database test;
with recursive a as
(select 1 from dual union select * from a as r)
select * from a;
1
1
create database db1;
create table db1.t1 (a int);
insert into db1.t1 values (3), (7), (1);
with recursive cte as
(select * from db1.t1 union select * from (select * from cte) as t)
select * from cte;
a
3
7
1
explain with recursive cte as
(select * from db1.t1 union select * from (select * from cte) as t)
select * from cte;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	3	
2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	3	
3	RECURSIVE UNION	<derived2>	ALL	NULL	NULL	NULL	NULL	3	
NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	
prepare stmt from "with recursive cte as
(select * from db1.t1 union select * from (select * from cte) as t)
select * from cte";
execute stmt;
a
3
7
1
execute stmt;
a
3
7
1
deallocate prepare stmt;
drop database db1;
create database test;
use test;
#
# MDEV-23406: query with mutually recursive CTEs when big_tables=1
#
set @save_big_tables=@@big_tables;
set big_tables=1;
create table  folks(id int, name char(32), dob date, father int, mother int);
insert into folks values
(100, 'Me', '2000-01-01', 20, 30),
(20, 'Dad', '1970-02-02', 10, 9),
(30, 'Mom', '1975-03-03', 8, 7),
(10, 'Grandpa Bill', '1940-04-05', null, null),
(9, 'Grandma Ann', '1941-10-15', null, null),
(25, 'Uncle Jim', '1968-11-18', 8, 7),
(98, 'Sister Amy', '2001-06-20', 20, 30),
(7, 'Grandma Sally', '1943-08-23', null, 6),
(8, 'Grandpa Ben', '1940-10-21', null, null),
(6, 'Grandgrandma Martha', '1923-05-17', null, null),
(67, 'Cousin Eddie', '1992-02-28', 25, 27),
(27, 'Auntie Melinda', '1971-03-29', null, null);
with recursive
ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
w_id, w_name, w_dob, w_father, w_mother)
as
(
select h.*, w.*
from folks h, folks w,  coupled_ancestors a
where a.father = h.id AND a.mother = w.id
union
select h.*, w.*
from folks v, folks h, folks w
where v.name = 'Me' and
(v.father = h.id AND v.mother= w.id)
),
coupled_ancestors (id, name, dob, father, mother)
as
(
select h_id, h_name, h_dob, h_father, h_mother
from ancestor_couples
union
select w_id, w_name, w_dob, w_father, w_mother
from ancestor_couples
)
select h_name, h_dob, w_name, w_dob
from ancestor_couples;
h_name	h_dob	w_name	w_dob
Dad	1970-02-02	Mom	1975-03-03
Grandpa Bill	1940-04-05	Grandma Ann	1941-10-15
Grandpa Ben	1940-10-21	Grandma Sally	1943-08-23
explain with recursive
ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
w_id, w_name, w_dob, w_father, w_mother)
as
(
select h.*, w.*
from folks h, folks w,  coupled_ancestors a
where a.father = h.id AND a.mother = w.id
union
select h.*, w.*
from folks v, folks h, folks w
where v.name = 'Me' and
(v.father = h.id AND v.mother= w.id)
),
coupled_ancestors (id, name, dob, father, mother)
as
(
select h_id, h_name, h_dob, h_father, h_mother
from ancestor_couples
union
select w_id, w_name, w_dob, w_father, w_mother
from ancestor_couples
)
select h_name, h_dob, w_name, w_dob
from ancestor_couples;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	<derived3>	ALL	NULL	NULL	NULL	NULL	1728	
4	DERIVED	<derived3>	ALL	NULL	NULL	NULL	NULL	1728	
5	RECURSIVE UNION	<derived3>	ALL	NULL	NULL	NULL	NULL	1728	
NULL	UNION RESULT	<union4,5>	ALL	NULL	NULL	NULL	NULL	NULL	
3	DERIVED	v	ALL	NULL	NULL	NULL	NULL	12	Using where
3	DERIVED	h	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
3	DERIVED	w	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (incremental, BNL join)
2	RECURSIVE UNION	<derived4>	ALL	NULL	NULL	NULL	NULL	2	
2	RECURSIVE UNION	h	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
2	RECURSIVE UNION	w	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (incremental, BNL join)
NULL	UNION RESULT	<union3,2>	ALL	NULL	NULL	NULL	NULL	NULL	
prepare stmt from "with recursive
ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
w_id, w_name, w_dob, w_father, w_mother)
as
(
select h.*, w.*
from folks h, folks w,  coupled_ancestors a
where a.father = h.id AND a.mother = w.id
union
select h.*, w.*
from folks v, folks h, folks w
where v.name = 'Me' and
(v.father = h.id AND v.mother= w.id)
),
coupled_ancestors (id, name, dob, father, mother)
as
(
select h_id, h_name, h_dob, h_father, h_mother
from ancestor_couples
union
select w_id, w_name, w_dob, w_father, w_mother
from ancestor_couples
)
select h_name, h_dob, w_name, w_dob
from ancestor_couples";
execute stmt;
h_name	h_dob	w_name	w_dob
Dad	1970-02-02	Mom	1975-03-03
Grandpa Bill	1940-04-05	Grandma Ann	1941-10-15
Grandpa Ben	1940-10-21	Grandma Sally	1943-08-23
execute stmt;
h_name	h_dob	w_name	w_dob
Dad	1970-02-02	Mom	1975-03-03
Grandpa Bill	1940-04-05	Grandma Ann	1941-10-15
Grandpa Ben	1940-10-21	Grandma Sally	1943-08-23
deallocate prepare stmt;
with recursive
ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
w_id, w_name, w_dob, w_father, w_mother)
as
(
select h.*, w.*
from folks h, folks w,  coupled_ancestors a
where a.father = h.id AND a.mother = w.id
),
coupled_ancestors (id, name, dob, father, mother)
as
(
select *
from folks
where name = 'Me'
  union all
select h_id, h_name, h_dob, h_father, h_mother
from ancestor_couples
union all
select w_id, w_name, w_dob, w_father, w_mother
from ancestor_couples
)
select h_name, h_dob, w_name, w_dob
from ancestor_couples;
h_name	h_dob	w_name	w_dob
Dad	1970-02-02	Mom	1975-03-03
Grandpa Bill	1940-04-05	Grandma Ann	1941-10-15
Grandpa Ben	1940-10-21	Grandma Sally	1943-08-23
explain with recursive
ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
w_id, w_name, w_dob, w_father, w_mother)
as
(
select h.*, w.*
from folks h, folks w,  coupled_ancestors a
where a.father = h.id AND a.mother = w.id
),
coupled_ancestors (id, name, dob, father, mother)
as
(
select *
from folks
where name = 'Me'
  union all
select h_id, h_name, h_dob, h_father, h_mother
from ancestor_couples
union all
select w_id, w_name, w_dob, w_father, w_mother
from ancestor_couples
)
select h_name, h_dob, w_name, w_dob
from ancestor_couples;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
3	DERIVED	folks	ALL	NULL	NULL	NULL	NULL	12	Using where
4	RECURSIVE UNION	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
5	RECURSIVE UNION	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
NULL	UNION RESULT	<union3,4,5>	ALL	NULL	NULL	NULL	NULL	NULL	
2	DERIVED	h	ALL	NULL	NULL	NULL	NULL	12	Using where
2	DERIVED	<derived3>	ref	key0	key0	5	test.h.id	2	
2	DERIVED	w	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
prepare stmt from "with recursive
ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
w_id, w_name, w_dob, w_father, w_mother)
as
(
select h.*, w.*
from folks h, folks w,  coupled_ancestors a
where a.father = h.id AND a.mother = w.id
),
coupled_ancestors (id, name, dob, father, mother)
as
(
select *
from folks
where name = 'Me'
  union all
select h_id, h_name, h_dob, h_father, h_mother
from ancestor_couples
union all
select w_id, w_name, w_dob, w_father, w_mother
from ancestor_couples
)
select h_name, h_dob, w_name, w_dob
from ancestor_couples";
execute stmt;
h_name	h_dob	w_name	w_dob
Dad	1970-02-02	Mom	1975-03-03
Grandpa Bill	1940-04-05	Grandma Ann	1941-10-15
Grandpa Ben	1940-10-21	Grandma Sally	1943-08-23
execute stmt;
h_name	h_dob	w_name	w_dob
Dad	1970-02-02	Mom	1975-03-03
Grandpa Bill	1940-04-05	Grandma Ann	1941-10-15
Grandpa Ben	1940-10-21	Grandma Sally	1943-08-23
deallocate prepare stmt;
drop table folks;
set big_tables=@save_big_tables;
#
# End of 10.2 tests
#
#
# MDEV-14217 [db crash] Recursive CTE when SELECT includes new field
#
CREATE TEMPORARY TABLE a_tbl (
a VARCHAR(33) PRIMARY KEY,
b VARCHAR(33)
);
INSERT INTO a_tbl VALUES ('block0', 'block0'), ('block1', NULL);
WITH RECURSIVE Q0 AS (
SELECT T0.a, T0.b, 5
FROM a_tbl T0
WHERE b IS NULL
UNION ALL
SELECT T1.a, T1.b
FROM Q0
JOIN a_tbl T1
ON T1.a=Q0.a
) SELECT distinct(Q0.a), Q0.b
FROM Q0;
ERROR 21000: The used SELECT statements have a different number of columns
DROP TABLE a_tbl;
WITH RECURSIVE x AS (SELECT 1,2 UNION ALL SELECT 1 FROM x) SELECT * FROM x;
ERROR 21000: The used SELECT statements have a different number of columns
#
# MDEV-15162: Setting user variable in recursive CTE
#
SET @c=1;
WITH RECURSIVE cte AS
(SELECT 5
UNION
SELECT @c:=@c+1 FROM cte WHERE @c<3)
SELECT * FROM cte;
5
5
2
3
#
# MDEV-14883: recursive references in operands of INTERSECT / EXCEPT
#
create table flights
(departure varchar(32),
arrival varchar(32),
carrier varchar(20),
flight_number char(7));
insert into flights values
('Seattle', 'Frankfurt', 'Lufthansa', 'LH 491'),
('Seattle', 'Amsterdam', 'KLM', 'KL 6032'),
('Seattle', 'Chicago', 'American', 'AA 2573'),
('Seattle', 'Los Angeles', 'Alaska Air', 'AS 410'),
('Chicago', 'New York', 'American', 'AA 375'),
('Chicago', 'Montreal', 'Air Canada', 'AC 3053'),
('Los Angeles', 'New York', 'Delta', 'DL 1197'),
('New York', 'London', 'British Airways', 'BA 1511'),
('London', 'Moscow', 'British Airways', 'BA 233'),
('Moscow', 'Tokyo', 'Aeroflot', 'SU 264'),
('Moscow', 'Dubai', 'Emirates', 'EK 2421'),
('Dubai', 'Tokyo', 'Emirates', 'EK 318'),
('Dubai', 'Bangkok', 'Emirates', 'EK 2142'),
('Beijing', 'Bangkok', 'Air China', 'CA 757'),
('Beijing', 'Tokyo', 'Air China', 'CA 6653'),
('Moscow', 'Bangkok', 'Aeroflot', 'SU 270'),
('New York', 'Reykjavik', 'Icelandair', 'FL 416'),
('New York', 'Paris', 'Air France', 'AF 23'),
('Amsterdam', 'Moscow', 'KLM', 'KL 903'),
('Frankfurt', 'Dubai', 'Lufthansa', 'LH 630'),
('Frankfurt', 'Moscow', 'Lufthansa', 'LH 1444'),
('Reykjavik', 'London', 'British Airways', 'BA 2229'),
('Frankfurt', 'Beijing', 'Air China', 'CA 966'),
('Tokyo', 'Seattle', 'ANA', 'NH 178'),
('Los Angeles', 'Tokyo', 'ANA', 'NH 175'),
('Moscow', 'Los Angeles', 'Aeroflot', 'SU 106'),
('Montreal', 'Paris', 'Air Canada', 'AC 870'),
('London', 'Delhi', 'British Airways', 'BA 143'),
('Delhi', 'Bangkok', 'Air India', 'AI 306'),
('Delhi', 'Dubai', 'Air India', 'AI 995'),
('Dubai', 'Cairo', 'Emirates', 'EK 927'),
('Cairo', 'Paris', 'Air France', 'AF 503'),
('Amsterdam', 'New York', 'Delta', 'DL 47'),
('New York', 'Seattle', 'American', 'AA 45'),
('Paris', 'Chicago', 'Air France', 'AF 6734');
create table distances
(city1 varchar(32),
city2 varchar(32),
dist int);
insert into distances values
('Seattle', 'Frankfurt', 5080),
('Seattle', 'Amsterdam', 4859),
('Seattle', 'Chicago', 1733),
('Seattle', 'Los Angeles', 960),
('Chicago', 'New York', 712),
('Chicago', 'Montreal', 746),
('Los Angeles', 'New York', 2446),
('New York', 'London', 3459),
('London', 'Moscow', 1554),
('Moscow', 'Tokyo', 4647),
('Moscow', 'Dubai', 2298),
('Dubai', 'Tokyo', 4929),
('Dubai', 'Bangkok', 3050),
('Beijing', 'Bangkok', 2046),
('Beijing', 'Tokyo', 1301),
('Moscow', 'Bangkok', 4390),
('New York', 'Reykjavik', 2613),
('New York', 'Paris', 3625),
('Amsterdam', 'Moscow', 1334),
('Frankfurt', 'Dubai', 3003),
('Frankfurt', 'Moscow', 1256),
('Reykjavik', 'London', 1173),
('Frankfurt', 'Beijing', 4836),
('Tokyo', 'Seattle', 4783),
('Los Angeles', 'Tokyo', 5479),
('Moscow', 'Los Angeles', 6071),
('Moscow', 'Reykjavik', 2052),
('Montreal', 'Paris', 3425),
('London', 'Delhi', 4159),
('London', 'Paris', 214),
('Delhi', 'Bangkok', 1810),
('Delhi', 'Dubai', 1369),
('Delhi', 'Beijing', 2350),
('Dubai', 'Cairo', 1501),
('Cairo', 'Paris', 1992),
('Amsterdam', 'New York', 3643),
('New York', 'Seattle', 2402),
('Paris', 'Chicago', 4136),
('Paris', 'Los Angeles', 5647);
with recursive destinations (city) as
(
select a.arrival from flights a where a.departure = 'Seattle'
  union
select b.arrival from destinations r, flights b where r.city = b.departure
)
select * from destinations;
city
Frankfurt
Amsterdam
Chicago
Los Angeles
New York
Montreal
Moscow
Dubai
Beijing
Tokyo
London
Bangkok
Reykjavik
Paris
Seattle
Cairo
Delhi
with recursive destinations (city) as
(
select a.arrival from flights a, distances d
where a.departure = 'Seattle' and
a.departure = d.city1 and a.arrival = d.city2 and
d.dist < 4000
union
select b.arrival from destinations r, flights b, distances d
where r.city = b.departure and
b.departure = d.city1 and b.arrival = d.city2 and
d.dist < 4000
)
select * from destinations;
city
Chicago
Los Angeles
New York
Montreal
London
Reykjavik
Paris
Seattle
Moscow
Dubai
Bangkok
Cairo
set standard_compliant_cte=0;
with recursive legs_to_destinations
(departure, arrival, dist, leg_no, acc_mileage) as
(
select a.departure, a.arrival, d.dist, 1, d.dist
from flights a, distances d
where a.departure = 'Seattle' and
a.departure = d.city1 and a.arrival = d.city2 and
d.dist < 4000
union all
select b.departure, b.arrival, d.dist, r.leg_no + 1, r.acc_mileage + d.dist
from legs_to_destinations r, flights b, distances d
where r.arrival = b.departure and
b.departure = d.city1 and b.arrival = d.city2 and
d.dist < 4000 and
b.arrival not in (select arrival from legs_to_destinations)
)
select * from legs_to_destinations;
departure	arrival	dist	leg_no	acc_mileage
Seattle	Chicago	1733	1	1733
Seattle	Los Angeles	960	1	960
Chicago	New York	712	2	2445
Chicago	Montreal	746	2	2479
Los Angeles	New York	2446	2	3406
New York	London	3459	3	6865
New York	London	3459	3	5904
New York	Reykjavik	2613	3	6019
New York	Reykjavik	2613	3	5058
New York	Paris	3625	3	7031
New York	Paris	3625	3	6070
Montreal	Paris	3425	3	5904
New York	Seattle	2402	3	5808
New York	Seattle	2402	3	4847
London	Moscow	1554	4	7458
London	Moscow	1554	4	8419
Moscow	Dubai	2298	5	10717
Moscow	Dubai	2298	5	9756
Dubai	Bangkok	3050	6	12806
Dubai	Bangkok	3050	6	13767
Dubai	Cairo	1501	6	11257
Dubai	Cairo	1501	6	12218
set standard_compliant_cte=default;
with recursive destinations (city) as
(
select a.arrival from flights a, distances d
where a.departure = 'Seattle' and
a.departure = d.city1 and a.arrival = d.city2 and
d.dist < 4000
union
select b.arrival from destinations r, flights b
where r.city = b.departure
intersect
select city2 from destinations s, distances d
where s.city = d.city1 and d.dist < 4000
)
select * from destinations;
city
Chicago
Los Angeles
New York
Montreal
London
Reykjavik
Paris
Seattle
Moscow
Dubai
Bangkok
Cairo
with recursive destinations (city) as
(
select a.arrival from flights a where a.departure = 'Seattle'
  union
select * from
(
select b.arrival from destinations r, flights b
where r.city = b.departure
except
select arrival from flights
where arrival in
('New York', 'London', 'Moscow', 'Dubai', 'Cairo', 'Tokyo')
) t
)
select * from destinations;
city
Frankfurt
Amsterdam
Chicago
Los Angeles
Montreal
Beijing
Bangkok
Paris
drop table flights, distances;
#
# MDEV-15159: Forced nullability of columns in recursive CTE
#
WITH RECURSIVE cte AS (
SELECT 1 AS a UNION ALL
SELECT NULL FROM cte WHERE a IS NOT NULL)
SELECT * FROM cte;
a
1
NULL
CREATE TABLE t1 (a int NOT NULL);
INSERT INTO t1 VALUES (0);
WITH RECURSIVE cte AS
(SELECT a FROM t1 where a=0 UNION SELECT NULL FROM cte)
SELECT * FROM cte;
a
0
NULL
DROP TABLE t1;
# End of 10.3 tests