summaryrefslogtreecommitdiff
path: root/sql/rpl_utility.cc
blob: 1b9e744bcc197595cbaf4cac2b3008a3ae383387 (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
/*
   Copyright (c) 2006, 2010, Oracle and/or its affiliates.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */

#include "rpl_utility.h"
#include "log_event.h"

#if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
#include "rpl_rli.h"
#include "sql_select.h"

/**
   Function to compare two size_t integers for their relative
   order. Used below.
 */
int compare(size_t a, size_t b)
{
  if (a < b)
    return -1;
  if (b < a)
    return 1;
  return 0;
}


/**
   Max value for an unsigned integer of 'bits' bits.

   The somewhat contorted expression is to avoid overflow.
 */
uint32 uint_max(int bits) {
  return (((1UL << (bits - 1)) - 1) << 1) | 1;
}


/**
   Compute the maximum display length of a field.

   @param sql_type Type of the field
   @param metadata The metadata from the master for the field.
   @return Maximum length of the field in bytes.
 */
static uint32
max_display_length_for_field(enum_field_types sql_type, unsigned int metadata)
{
  DBUG_PRINT("debug", ("sql_type: %d, metadata: 0x%x", sql_type, metadata));
  DBUG_ASSERT(metadata >> 16 == 0);

  switch (sql_type) {
  case MYSQL_TYPE_NEWDECIMAL:
    return metadata >> 8;

  case MYSQL_TYPE_FLOAT:
    return 12;

  case MYSQL_TYPE_DOUBLE:
    return 22;

  case MYSQL_TYPE_SET:
  case MYSQL_TYPE_ENUM:
      return metadata & 0x00ff;

  case MYSQL_TYPE_STRING:
  {
    uchar type= metadata >> 8;
    if (type == MYSQL_TYPE_SET || type == MYSQL_TYPE_ENUM)
      return metadata & 0xff;
    else
      /* This is taken from Field_string::unpack. */
      return (((metadata >> 4) & 0x300) ^ 0x300) + (metadata & 0x00ff);
  }

  case MYSQL_TYPE_YEAR:
  case MYSQL_TYPE_TINY:
    return 4;

  case MYSQL_TYPE_SHORT:
    return 6;

  case MYSQL_TYPE_INT24:
    return 9;

  case MYSQL_TYPE_LONG:
    return 11;

#ifdef HAVE_LONG_LONG
  case MYSQL_TYPE_LONGLONG:
    return 20;

#endif
  case MYSQL_TYPE_NULL:
    return 0;

  case MYSQL_TYPE_NEWDATE:
    return 3;

  case MYSQL_TYPE_DATE:
  case MYSQL_TYPE_TIME:
    return 3;

  case MYSQL_TYPE_TIMESTAMP:
    return 4;

  case MYSQL_TYPE_DATETIME:
    return 8;

  case MYSQL_TYPE_BIT:
    /*
      Decode the size of the bit field from the master.
    */
    DBUG_ASSERT((metadata & 0xff) <= 7);
    return 8 * (metadata >> 8U) + (metadata & 0x00ff);

  case MYSQL_TYPE_VAR_STRING:
  case MYSQL_TYPE_VARCHAR:
    return metadata;

    /*
      The actual length for these types does not really matter since
      they are used to calc_pack_length, which ignores the given
      length for these types.

      Since we want this to be accurate for other uses, we return the
      maximum size in bytes of these BLOBs.
    */

  case MYSQL_TYPE_TINY_BLOB:
    return uint_max(1 * 8);

  case MYSQL_TYPE_MEDIUM_BLOB:
    return uint_max(3 * 8);

  case MYSQL_TYPE_BLOB:
    /*
      For the blob type, Field::real_type() lies and say that all
      blobs are of type MYSQL_TYPE_BLOB. In that case, we have to look
      at the length instead to decide what the max display size is.
     */
    return uint_max(metadata * 8);

  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_GEOMETRY:
    return uint_max(4 * 8);

  default:
    return ~(uint32) 0;
  }
}


/*
  Compare the pack lengths of a source field (on the master) and a
  target field (on the slave).

  @param field    Target field.
  @param type     Source field type.
  @param metadata Source field metadata.

  @retval -1 The length of the source field is smaller than the target field.
  @retval  0 The length of the source and target fields are the same.
  @retval  1 The length of the source field is greater than the target field.
 */
int compare_lengths(Field *field, enum_field_types source_type, uint16 metadata)
{
  DBUG_ENTER("compare_lengths");
  size_t const source_length=
    max_display_length_for_field(source_type, metadata);
  size_t const target_length= field->max_display_length();
  DBUG_PRINT("debug", ("source_length: %lu, source_type: %u,"
                       " target_length: %lu, target_type: %u",
                       (unsigned long) source_length, source_type,
                       (unsigned long) target_length, field->real_type()));
  int result= compare(source_length, target_length);
  DBUG_PRINT("result", ("%d", result));
  DBUG_RETURN(result);
}

/*********************************************************************
 *                   table_def member definitions                    *
 *********************************************************************/

/*
  This function returns the field size in raw bytes based on the type
  and the encoded field data from the master's raw data.
*/
uint32 table_def::calc_field_size(uint col, uchar *master_data) const
{
  uint32 length;

  switch (type(col)) {
  case MYSQL_TYPE_NEWDECIMAL:
    length= my_decimal_get_binary_size(m_field_metadata[col] >> 8, 
                                       m_field_metadata[col] & 0xff);
    break;
  case MYSQL_TYPE_DECIMAL:
  case MYSQL_TYPE_FLOAT:
  case MYSQL_TYPE_DOUBLE:
    length= m_field_metadata[col];
    break;
  /*
    The cases for SET and ENUM are include for completeness, however
    both are mapped to type MYSQL_TYPE_STRING and their real types
    are encoded in the field metadata.
  */
  case MYSQL_TYPE_SET:
  case MYSQL_TYPE_ENUM:
  case MYSQL_TYPE_STRING:
  {
    uchar type= m_field_metadata[col] >> 8U;
    if ((type == MYSQL_TYPE_SET) || (type == MYSQL_TYPE_ENUM))
      length= m_field_metadata[col] & 0x00ff;
    else
    {
      /*
        We are reading the actual size from the master_data record
        because this field has the actual lengh stored in the first
        byte.
      */
      length= (uint) *master_data + 1;
      DBUG_ASSERT(length != 0);
    }
    break;
  }
  case MYSQL_TYPE_YEAR:
  case MYSQL_TYPE_TINY:
    length= 1;
    break;
  case MYSQL_TYPE_SHORT:
    length= 2;
    break;
  case MYSQL_TYPE_INT24:
    length= 3;
    break;
  case MYSQL_TYPE_LONG:
    length= 4;
    break;
#ifdef HAVE_LONG_LONG
  case MYSQL_TYPE_LONGLONG:
    length= 8;
    break;
#endif
  case MYSQL_TYPE_NULL:
    length= 0;
    break;
  case MYSQL_TYPE_NEWDATE:
    length= 3;
    break;
  case MYSQL_TYPE_DATE:
  case MYSQL_TYPE_TIME:
    length= 3;
    break;
  case MYSQL_TYPE_TIMESTAMP:
    length= 4;
    break;
  case MYSQL_TYPE_DATETIME:
    length= 8;
    break;
  case MYSQL_TYPE_BIT:
  {
    /*
      Decode the size of the bit field from the master.
        from_len is the length in bytes from the master
        from_bit_len is the number of extra bits stored in the master record
      If from_bit_len is not 0, add 1 to the length to account for accurate
      number of bytes needed.
    */
    uint from_len= (m_field_metadata[col] >> 8U) & 0x00ff;
    uint from_bit_len= m_field_metadata[col] & 0x00ff;
    DBUG_ASSERT(from_bit_len <= 7);
    length= from_len + ((from_bit_len > 0) ? 1 : 0);
    break;
  }
  case MYSQL_TYPE_VARCHAR:
  {
    length= m_field_metadata[col] > 255 ? 2 : 1; // c&p of Field_varstring::data_length()
    DBUG_ASSERT(uint2korr(master_data) > 0);
    length+= length == 1 ? (uint32) *master_data : uint2korr(master_data);
    break;
  }
  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_MEDIUM_BLOB:
  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_BLOB:
  case MYSQL_TYPE_GEOMETRY:
  {
#if 1
    /*
      BUG#29549: 
      This is currently broken for NDB, which is using big-endian
      order when packing length of BLOB. Once they have decided how to
      fix the issue, we can enable the code below to make sure to
      always read the length in little-endian order.
    */
    Field_blob fb(m_field_metadata[col]);
    length= fb.get_packed_size(master_data);
#else
    /*
      Compute the length of the data. We cannot use get_length() here
      since it is dependent on the specific table (and also checks the
      packlength using the internal 'table' pointer) and replication
      is using a fixed format for storing data in the binlog.
    */
    switch (m_field_metadata[col]) {
    case 1:
      length= *master_data;
      break;
    case 2:
      length= uint2korr(master_data);
      break;
    case 3:
      length= uint3korr(master_data);
      break;
    case 4:
      length= uint4korr(master_data);
      break;
    default:
      DBUG_ASSERT(0);		// Should not come here
      break;
    }

    length+= m_field_metadata[col];
#endif
    break;
  }
  default:
    length= ~(uint32) 0;
  }
  return length;
}


/**
 */
void show_sql_type(enum_field_types type, uint16 metadata, String *str, CHARSET_INFO *field_cs)
{
  DBUG_ENTER("show_sql_type");
  DBUG_PRINT("enter", ("type: %d, metadata: 0x%x", type, metadata));

  switch (type)
  {
  case MYSQL_TYPE_TINY:
    str->set_ascii(STRING_WITH_LEN("tinyint"));
    break;

  case MYSQL_TYPE_SHORT:
    str->set_ascii(STRING_WITH_LEN("smallint"));
    break;

  case MYSQL_TYPE_LONG:
    str->set_ascii(STRING_WITH_LEN("int"));
    break;

  case MYSQL_TYPE_FLOAT:
    str->set_ascii(STRING_WITH_LEN("float"));
    break;

  case MYSQL_TYPE_DOUBLE:
    str->set_ascii(STRING_WITH_LEN("double"));
    break;

  case MYSQL_TYPE_NULL:
    str->set_ascii(STRING_WITH_LEN("null"));
    break;

  case MYSQL_TYPE_TIMESTAMP:
    str->set_ascii(STRING_WITH_LEN("timestamp"));
    break;

  case MYSQL_TYPE_LONGLONG:
    str->set_ascii(STRING_WITH_LEN("bigint"));
    break;

  case MYSQL_TYPE_INT24:
    str->set_ascii(STRING_WITH_LEN("mediumint"));
    break;

  case MYSQL_TYPE_NEWDATE:
  case MYSQL_TYPE_DATE:
    str->set_ascii(STRING_WITH_LEN("date"));
    break;

  case MYSQL_TYPE_TIME:
    str->set_ascii(STRING_WITH_LEN("time"));
    break;

  case MYSQL_TYPE_DATETIME:
    str->set_ascii(STRING_WITH_LEN("datetime"));
    break;

  case MYSQL_TYPE_YEAR:
    str->set_ascii(STRING_WITH_LEN("year"));
    break;

  case MYSQL_TYPE_VAR_STRING:
  case MYSQL_TYPE_VARCHAR:
    {
      CHARSET_INFO *cs= str->charset();
      uint32 length=
        cs->cset->snprintf(cs, (char*) str->ptr(), str->alloced_length(),
                           "varchar(%u)", metadata);
      str->length(length);
    }
    break;

  case MYSQL_TYPE_BIT:
    {
      CHARSET_INFO *cs= str->charset();
      int bit_length= 8 * (metadata >> 8) + (metadata & 0xFF);
      uint32 length=
        cs->cset->snprintf(cs, (char*) str->ptr(), str->alloced_length(),
                           "bit(%d)", bit_length);
      str->length(length);
    }
    break;

  case MYSQL_TYPE_DECIMAL:
    {
      CHARSET_INFO *cs= str->charset();
      uint32 length=
        cs->cset->snprintf(cs, (char*) str->ptr(), str->alloced_length(),
                           "decimal(%d,?)", metadata);
      str->length(length);
    }
    break;

  case MYSQL_TYPE_NEWDECIMAL:
    {
      CHARSET_INFO *cs= str->charset();
      uint32 length=
        cs->cset->snprintf(cs, (char*) str->ptr(), str->alloced_length(),
                           "decimal(%d,%d)", metadata >> 8, metadata & 0xff);
      str->length(length);
    }
    break;

  case MYSQL_TYPE_ENUM:
    str->set_ascii(STRING_WITH_LEN("enum"));
    break;

  case MYSQL_TYPE_SET:
    str->set_ascii(STRING_WITH_LEN("set"));
    break;

  case MYSQL_TYPE_BLOB:
    /*
      Field::real_type() lies regarding the actual type of a BLOB, so
      it is necessary to check the pack length to figure out what kind
      of blob it really is.
     */
    switch (get_blob_type_from_length(metadata))
    {
    case MYSQL_TYPE_TINY_BLOB:
      str->set_ascii(STRING_WITH_LEN("tinyblob"));
      break;

    case MYSQL_TYPE_MEDIUM_BLOB:
      str->set_ascii(STRING_WITH_LEN("mediumblob"));
      break;

    case MYSQL_TYPE_LONG_BLOB:
      str->set_ascii(STRING_WITH_LEN("longblob"));
      break;

    case MYSQL_TYPE_BLOB:
      str->set_ascii(STRING_WITH_LEN("blob"));
      break;

    default:
      DBUG_ASSERT(0);
      break;
    }
    break;

  case MYSQL_TYPE_STRING:
    {
      /*
        This is taken from Field_string::unpack.
      */
      CHARSET_INFO *cs= str->charset();
      uint bytes= (((metadata >> 4) & 0x300) ^ 0x300) + (metadata & 0x00ff);
      uint32 length=
        cs->cset->snprintf(cs, (char*) str->ptr(), str->alloced_length(),
                           "char(%d)", bytes / field_cs->mbmaxlen);
      str->length(length);
    }
    break;

  case MYSQL_TYPE_GEOMETRY:
    str->set_ascii(STRING_WITH_LEN("geometry"));
    break;

  default:
    str->set_ascii(STRING_WITH_LEN("<unknown type>"));
  }
  DBUG_VOID_RETURN;
}


/**
   Check the order variable and print errors if the order is not
   acceptable according to the current settings.

   @param order  The computed order of the conversion needed.
   @param rli    The relay log info data structure: for error reporting.
 */
bool is_conversion_ok(int order, Relay_log_info *rli)
{
  DBUG_ENTER("is_conversion_ok");
  bool allow_non_lossy, allow_lossy;

  allow_non_lossy = slave_type_conversions_options &
                    (ULL(1) << SLAVE_TYPE_CONVERSIONS_ALL_NON_LOSSY);
  allow_lossy= slave_type_conversions_options &
               (ULL(1) << SLAVE_TYPE_CONVERSIONS_ALL_LOSSY);

  DBUG_PRINT("enter", ("order: %d, flags:%s%s", order,
                       allow_non_lossy ? " ALL_NON_LOSSY" : "",
                       allow_lossy ? " ALL_LOSSY" : ""));
  if (order < 0 && !allow_non_lossy)
  {
    /* !!! Add error message saying that non-lossy conversions need to be allowed. */
    DBUG_RETURN(false);
  }

  if (order > 0 && !allow_lossy)
  {
    /* !!! Add error message saying that lossy conversions need to be allowed. */
    DBUG_RETURN(false);
  }

  DBUG_RETURN(true);
}


/**
   Can a type potentially be converted to another type?

   This function check if the types are convertible and what
   conversion is required.

   If conversion is not possible, and error is printed.

   If conversion is possible:

   - *order will be set to -1 if source type is smaller than target
     type and a non-lossy conversion can be required. This includes
     the case where the field types are different but types could
     actually be converted in either direction.

   - *order will be set to 0 if no conversion is required.

   - *order will be set to 1 if the source type is strictly larger
      than the target type and that conversion is potentially lossy.

   @param[in] field    Target field
   @param[in] type     Source field type
   @param[in] metadata Source field metadata
   @param[in] rli      Relay log info (for error reporting)
   @param[in] mflags   Flags from the table map event
   @param[out] order   Order between source field and target field

   @return @c true if conversion is possible according to the current
   settings, @c false if conversion is not possible according to the
   current setting.
 */
static bool
can_convert_field_to(Field *field,
                     enum_field_types source_type, uint16 metadata,
                     Relay_log_info *rli, uint16 mflags,
                     int *order_var)
{
  DBUG_ENTER("can_convert_field_to");
#ifndef DBUG_OFF
  char field_type_buf[MAX_FIELD_WIDTH];
  String field_type(field_type_buf, sizeof(field_type_buf), &my_charset_latin1);
  field->sql_type(field_type);
  DBUG_PRINT("enter", ("field_type: %s, target_type: %d, source_type: %d, source_metadata: 0x%x",
                       field_type.c_ptr_safe(), field->real_type(), source_type, metadata));
#endif
  /*
    If the real type is the same, we need to check the metadata to
    decide if conversions are allowed.
   */
  if (field->real_type() == source_type)
  {
    if (metadata == 0) // Metadata can only be zero if no metadata was provided
    {
      /*
        If there is no metadata, we either have an old event where no
        metadata were supplied, or a type that does not require any
        metadata. In either case, conversion can be done but no
        conversion table is necessary.
       */
      DBUG_PRINT("debug", ("Base types are identical, but there is no metadata"));
      *order_var= 0;
      DBUG_RETURN(true);
    }

    DBUG_PRINT("debug", ("Base types are identical, doing field size comparison"));
    if (field->compatible_field_size(metadata, rli, mflags, order_var))
      DBUG_RETURN(is_conversion_ok(*order_var, rli));
    else
      DBUG_RETURN(false);
  }
  else if (!slave_type_conversions_options)
    DBUG_RETURN(false);

  /*
    Here, from and to will always be different. Since the types are
    different, we cannot use the compatible_field_size() function, but
    have to rely on hard-coded max-sizes for fields.
  */

  DBUG_PRINT("debug", ("Base types are different, checking conversion"));
  switch (source_type)                      // Source type (on master)
  {
  case MYSQL_TYPE_DECIMAL:
  case MYSQL_TYPE_NEWDECIMAL:
  case MYSQL_TYPE_FLOAT:
  case MYSQL_TYPE_DOUBLE:
    switch (field->real_type())
    {
    case MYSQL_TYPE_NEWDECIMAL:
      /*
        Then the other type is either FLOAT, DOUBLE, or old style
        DECIMAL, so we require lossy conversion.
      */
      *order_var= 1;
      DBUG_RETURN(is_conversion_ok(*order_var, rli));
      
    case MYSQL_TYPE_DECIMAL:
    case MYSQL_TYPE_FLOAT:
    case MYSQL_TYPE_DOUBLE:
    {
      if (source_type == MYSQL_TYPE_NEWDECIMAL ||
          source_type == MYSQL_TYPE_DECIMAL)
        *order_var = 1;                         // Always require lossy conversions
      else
        *order_var= compare_lengths(field, source_type, metadata);
      DBUG_ASSERT(*order_var != 0);
      DBUG_RETURN(is_conversion_ok(*order_var, rli));
    }

    default:
      DBUG_RETURN(false);
    }
    break;

  /*
    The length comparison check will do the correct job of comparing
    the field lengths (in bytes) of two integer types.
  */
  case MYSQL_TYPE_TINY:
  case MYSQL_TYPE_SHORT:
  case MYSQL_TYPE_INT24:
  case MYSQL_TYPE_LONG:
  case MYSQL_TYPE_LONGLONG:
    switch (field->real_type())
    {
    case MYSQL_TYPE_TINY:
    case MYSQL_TYPE_SHORT:
    case MYSQL_TYPE_INT24:
    case MYSQL_TYPE_LONG:
    case MYSQL_TYPE_LONGLONG:
      *order_var= compare_lengths(field, source_type, metadata);
      DBUG_ASSERT(*order_var != 0);
      DBUG_RETURN(is_conversion_ok(*order_var, rli));

    default:
      DBUG_RETURN(false);
    }
    break;

  /*
    Since source and target type is different, and it is not possible
    to convert bit types to anything else, this will return false.
   */
  case MYSQL_TYPE_BIT:
    DBUG_RETURN(false);

  /*
    If all conversions are disabled, it is not allowed to convert
    between these types. Since the TEXT vs. BINARY is distinguished by
    the charset, and the charset is not replicated, we cannot
    currently distinguish between , e.g., TEXT and BLOB.
   */
  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_MEDIUM_BLOB:
  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_BLOB:
  case MYSQL_TYPE_STRING:
  case MYSQL_TYPE_VAR_STRING:
  case MYSQL_TYPE_VARCHAR:
    switch (field->real_type())
    {
    case MYSQL_TYPE_TINY_BLOB:
    case MYSQL_TYPE_MEDIUM_BLOB:
    case MYSQL_TYPE_LONG_BLOB:
    case MYSQL_TYPE_BLOB:
    case MYSQL_TYPE_STRING:
    case MYSQL_TYPE_VAR_STRING:
    case MYSQL_TYPE_VARCHAR:
      *order_var= compare_lengths(field, source_type, metadata);
      /*
        Here we know that the types are different, so if the order
        gives that they do not require any conversion, we still need
        to have non-lossy conversion enabled to allow conversion
        between different (string) types of the same length.
       */
      if (*order_var == 0)
        *order_var= -1;
      DBUG_RETURN(is_conversion_ok(*order_var, rli));

    default:
      DBUG_RETURN(false);
    }
    break;

  case MYSQL_TYPE_GEOMETRY:
  case MYSQL_TYPE_TIMESTAMP:
  case MYSQL_TYPE_DATE:
  case MYSQL_TYPE_TIME:
  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_YEAR:
  case MYSQL_TYPE_NEWDATE:
  case MYSQL_TYPE_NULL:
  case MYSQL_TYPE_ENUM:
  case MYSQL_TYPE_SET:
    DBUG_RETURN(false);
  }
  DBUG_RETURN(false);                                 // To keep GCC happy
}


/**
  Is the definition compatible with a table?

  This function will compare the master table with an existing table
  on the slave and see if they are compatible with respect to the
  current settings of @c SLAVE_TYPE_CONVERSIONS.

  If the tables are compatible and conversions are required, @c
  *tmp_table_var will be set to a virtual temporary table with field
  pointers for the fields that require conversions.  This allow simple
  checking of whether a conversion are to be applied or not.

  If tables are compatible, but no conversions are necessary, @c
  *tmp_table_var will be set to NULL.

  @param rli_arg[in]
  Relay log info, for error reporting.

  @param table[in]
  Table to compare with

  @param tmp_table_var[out]
  Virtual temporary table for performing conversions, if necessary.

  @retval true Master table is compatible with slave table.
  @retval false Master table is not compatible with slave table.
*/
bool
table_def::compatible_with(THD *thd, Relay_log_info *rli,
                           TABLE *table, TABLE **conv_table_var)
  const
{
  /*
    We only check the initial columns for the tables.
  */
  uint const cols_to_check= min(table->s->fields, size());
  TABLE *tmp_table= NULL;

  for (uint col= 0 ; col < cols_to_check ; ++col)
  {
    Field *const field= table->field[col];
    int order;
    if (can_convert_field_to(field, type(col), field_metadata(col), rli, m_flags, &order))
    {
      DBUG_PRINT("debug", ("Checking column %d -"
                           " field '%s' can be converted - order: %d",
                           col, field->field_name, order));
      DBUG_ASSERT(order >= -1 && order <= 1);

      /*
        If order is not 0, a conversion is required, so we need to set
        up the conversion table.
       */
      if (order != 0 && tmp_table == NULL)
      {
        /*
          This will create the full table with all fields. This is
          necessary to ge the correct field lengths for the record.
        */
        tmp_table= create_conversion_table(thd, rli, table);
        if (tmp_table == NULL)
            return false;
        /*
          Clear all fields up to, but not including, this column.
        */
        for (unsigned int i= 0; i < col; ++i)
          tmp_table->field[i]= NULL;
      }

      if (order == 0 && tmp_table != NULL)
        tmp_table->field[col]= NULL;
    }
    else
    {
      DBUG_PRINT("debug", ("Checking column %d -"
                           " field '%s' can not be converted",
                           col, field->field_name));
      DBUG_ASSERT(col < size() && col < table->s->fields);
      DBUG_ASSERT(table->s->db.str && table->s->table_name.str);
      const char *db_name= table->s->db.str;
      const char *tbl_name= table->s->table_name.str;
      char source_buf[MAX_FIELD_WIDTH];
      char target_buf[MAX_FIELD_WIDTH];
      String source_type(source_buf, sizeof(source_buf), &my_charset_latin1);
      String target_type(target_buf, sizeof(target_buf), &my_charset_latin1);
      show_sql_type(type(col), field_metadata(col), &source_type, field->charset());
      field->sql_type(target_type);
      rli->report(ERROR_LEVEL, ER_SLAVE_CONVERSION_FAILED,
                  ER(ER_SLAVE_CONVERSION_FAILED),
                  col, db_name, tbl_name,
                  source_type.c_ptr_safe(), target_type.c_ptr_safe());
      return false;
    }
  }

#ifndef DBUG_OFF
  if (tmp_table)
  {
    for (unsigned int col= 0; col < tmp_table->s->fields; ++col)
      if (tmp_table->field[col])
      {
        char source_buf[MAX_FIELD_WIDTH];
        char target_buf[MAX_FIELD_WIDTH];
        String source_type(source_buf, sizeof(source_buf), &my_charset_latin1);
        String target_type(target_buf, sizeof(target_buf), &my_charset_latin1);
        tmp_table->field[col]->sql_type(source_type);
        table->field[col]->sql_type(target_type);
        DBUG_PRINT("debug", ("Field %s - conversion required."
                             " Source type: '%s', Target type: '%s'",
                             tmp_table->field[col]->field_name,
                             source_type.c_ptr_safe(), target_type.c_ptr_safe()));
      }
  }
#endif

  *conv_table_var= tmp_table;
  return true;
}

/**
  Create a conversion table.

  If the function is unable to create the conversion table, an error
  will be printed and NULL will be returned.

  @return Pointer to conversion table, or NULL if unable to create
  conversion table.
 */

TABLE *table_def::create_conversion_table(THD *thd, Relay_log_info *rli, TABLE *target_table) const
{
  DBUG_ENTER("table_def::create_conversion_table");

  List<Create_field> field_list;

  for (uint col= 0 ; col < size() ; ++col)
  {
    Create_field *field_def=
      (Create_field*) alloc_root(thd->mem_root, sizeof(Create_field));
    if (field_list.push_back(field_def))
      DBUG_RETURN(NULL);

    uint decimals= 0;
    TYPELIB* interval= NULL;
    uint pack_length= 0;
    uint32 max_length=
      max_display_length_for_field(type(col), field_metadata(col));

    switch(type(col))
    {
      int precision;
    case MYSQL_TYPE_ENUM:
    case MYSQL_TYPE_SET:
      interval= static_cast<Field_enum*>(target_table->field[col])->typelib;
      pack_length= field_metadata(col) & 0x00ff;
      break;

    case MYSQL_TYPE_NEWDECIMAL:
      /*
        The display length of a DECIMAL type is not the same as the
        length that should be supplied to make_field, so we correct
        the length here.
       */
      precision= field_metadata(col) >> 8;
      decimals= field_metadata(col) & 0x00ff;
      max_length=
        my_decimal_precision_to_length(precision, decimals, FALSE);
      break;

    case MYSQL_TYPE_DECIMAL:
      precision= field_metadata(col);
      decimals= static_cast<Field_num*>(target_table->field[col])->dec;
      max_length= field_metadata(col);
      break;

    case MYSQL_TYPE_TINY_BLOB:
    case MYSQL_TYPE_MEDIUM_BLOB:
    case MYSQL_TYPE_LONG_BLOB:
    case MYSQL_TYPE_BLOB:
    case MYSQL_TYPE_GEOMETRY:
      pack_length= field_metadata(col) & 0x00ff;
      break;

    default:
      break;
    }

    DBUG_PRINT("debug", ("sql_type: %d, target_field: '%s', max_length: %d, decimals: %d,"
                         " maybe_null: %d, unsigned_flag: %d, pack_length: %u",
                         type(col), target_table->field[col]->field_name,
                         max_length, decimals, TRUE, FALSE, pack_length));
    field_def->init_for_tmp_table(type(col),
                                  max_length,
                                  decimals,
                                  TRUE,         // maybe_null
                                  FALSE,        // unsigned_flag
                                  pack_length);
    field_def->charset= target_table->field[col]->charset();
    field_def->interval= interval;
  }

  TABLE *conv_table= create_virtual_tmp_table(thd, field_list);
  if (conv_table == NULL)
    rli->report(ERROR_LEVEL, ER_SLAVE_CANT_CREATE_CONVERSION,
                ER(ER_SLAVE_CANT_CREATE_CONVERSION),
                target_table->s->db.str,
                target_table->s->table_name.str);
  DBUG_RETURN(conv_table);
}
#endif /* MYSQL_CLIENT */

table_def::table_def(unsigned char *types, ulong size,
                     uchar *field_metadata, int metadata_size,
                     uchar *null_bitmap, uint16 flags)
  : m_size(size), m_type(0), m_field_metadata_size(metadata_size),
    m_field_metadata(0), m_null_bits(0), m_flags(flags),
    m_memory(NULL)
{
  m_memory= (uchar *)my_multi_malloc(MYF(MY_WME),
                                     &m_type, size,
                                     &m_field_metadata,
                                     size * sizeof(uint16),
                                     &m_null_bits, (size + 7) / 8,
                                     NULL);

  bzero(m_field_metadata, size * sizeof(uint16));

  if (m_type)
    memcpy(m_type, types, size);
  else
    m_size= 0;
  /*
    Extract the data from the table map into the field metadata array
    iff there is field metadata. The variable metadata_size will be
    0 if we are replicating from an older version server since no field
    metadata was written to the table map. This can also happen if 
    there were no fields in the master that needed extra metadata.
  */
  if (m_size && metadata_size)
  { 
    int index= 0;
    for (unsigned int i= 0; i < m_size; i++)
    {
      switch (m_type[i]) {
      case MYSQL_TYPE_TINY_BLOB:
      case MYSQL_TYPE_BLOB:
      case MYSQL_TYPE_MEDIUM_BLOB:
      case MYSQL_TYPE_LONG_BLOB:
      case MYSQL_TYPE_DOUBLE:
      case MYSQL_TYPE_FLOAT:
      case MYSQL_TYPE_GEOMETRY:
      {
        /*
          These types store a single byte.
        */
        m_field_metadata[i]= field_metadata[index];
        index++;
        break;
      }
      case MYSQL_TYPE_SET:
      case MYSQL_TYPE_ENUM:
      case MYSQL_TYPE_STRING:
      {
        uint16 x= field_metadata[index++] << 8U; // real_type
        x+= field_metadata[index++];            // pack or field length
        m_field_metadata[i]= x;
        break;
      }
      case MYSQL_TYPE_BIT:
      {
        uint16 x= field_metadata[index++]; 
        x = x + (field_metadata[index++] << 8U);
        m_field_metadata[i]= x;
        break;
      }
      case MYSQL_TYPE_VARCHAR:
      {
        /*
          These types store two bytes.
        */
        char *ptr= (char *)&field_metadata[index];
        m_field_metadata[i]= uint2korr(ptr);
        index= index + 2;
        break;
      }
      case MYSQL_TYPE_NEWDECIMAL:
      {
        uint16 x= field_metadata[index++] << 8U; // precision
        x+= field_metadata[index++];            // decimals
        m_field_metadata[i]= x;
        break;
      }
      default:
        m_field_metadata[i]= 0;
        break;
      }
    }
  }
  if (m_size && null_bitmap)
    memcpy(m_null_bits, null_bitmap, (m_size + 7) / 8);
}


table_def::~table_def()
{
  my_free(m_memory);
#ifndef DBUG_OFF
  m_type= 0;
  m_size= 0;
#endif
}


/**
   @param   even_buf    point to the buffer containing serialized event
   @param   event_len   length of the event accounting possible checksum alg

   @return  TRUE        if test fails
            FALSE       as success
*/
bool event_checksum_test(uchar *event_buf, ulong event_len, uint8 alg)
{
  bool res= FALSE;
  uint16 flags= 0; // to store in FD's buffer flags orig value

  if (alg != BINLOG_CHECKSUM_ALG_OFF && alg != BINLOG_CHECKSUM_ALG_UNDEF)
  {
    ha_checksum incoming;
    ha_checksum computed;

    if (event_buf[EVENT_TYPE_OFFSET] == FORMAT_DESCRIPTION_EVENT)
    {
#ifndef DBUG_OFF
      int8 fd_alg= event_buf[event_len - BINLOG_CHECKSUM_LEN - 
                             BINLOG_CHECKSUM_ALG_DESC_LEN];
#endif
      /*
        FD event is checksummed and therefore verified w/o the binlog-in-use flag
      */
      flags= uint2korr(event_buf + FLAGS_OFFSET);
      if (flags & LOG_EVENT_BINLOG_IN_USE_F)
        event_buf[FLAGS_OFFSET] &= ~LOG_EVENT_BINLOG_IN_USE_F;
      /* 
         The only algorithm currently is CRC32. Zero indicates 
         the binlog file is checksum-free *except* the FD-event.
      */
      DBUG_ASSERT(fd_alg == BINLOG_CHECKSUM_ALG_CRC32 || fd_alg == 0);
      DBUG_ASSERT(alg == BINLOG_CHECKSUM_ALG_CRC32);
      /*
        Complile time guard to watch over  the max number of alg
      */
      compile_time_assert(BINLOG_CHECKSUM_ALG_ENUM_END <= 0x80);
    }
    incoming= uint4korr(event_buf + event_len - BINLOG_CHECKSUM_LEN);
    computed= my_checksum(0L, NULL, 0);
    /* checksum the event content but the checksum part itself */
    computed= my_checksum(computed, (const uchar*) event_buf, 
                          event_len - BINLOG_CHECKSUM_LEN);
    if (flags != 0)
    {
      /* restoring the orig value of flags of FD */
      DBUG_ASSERT(event_buf[EVENT_TYPE_OFFSET] == FORMAT_DESCRIPTION_EVENT);
      event_buf[FLAGS_OFFSET]= (uchar) flags;
    }
    res= !(computed == incoming);
  }
  return DBUG_EVALUATE_IF("simulate_checksum_test_failure", TRUE, res);
}

#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)

Deferred_log_events::Deferred_log_events(Relay_log_info *rli) : last_added(NULL)
{
  my_init_dynamic_array(&array, sizeof(Log_event *), 32, 16, MYF(0));
}

Deferred_log_events::~Deferred_log_events() 
{
  delete_dynamic(&array);
}

int Deferred_log_events::add(Log_event *ev)
{
  last_added= ev;
  insert_dynamic(&array, (uchar*) &ev);
  return 0;
}

bool Deferred_log_events::is_empty()
{  
  return array.elements == 0;
}

bool Deferred_log_events::execute(Relay_log_info *rli)
{
  bool res= false;

  DBUG_ASSERT(rli->deferred_events_collecting);

  rli->deferred_events_collecting= false;
  for (uint i=  0; !res && i < array.elements; i++)
  {
    Log_event *ev= (* (Log_event **)
                    dynamic_array_ptr(&array, i));
    res= ev->apply_event(rli);
  }
  rli->deferred_events_collecting= true;
  return res;
}

void Deferred_log_events::rewind()
{
  /*
    Reset preceeding Query log event events which execution was
    deferred because of slave side filtering.
  */
  if (!is_empty())
  {
    for (uint i=  0; i < array.elements; i++)
    {
      Log_event *ev= *(Log_event **) dynamic_array_ptr(&array, i);
      delete ev;
    }
    if (array.elements > array.max_element)
      freeze_size(&array);
    reset_dynamic(&array);
  }
  last_added= NULL;
}

#endif