diff options
Diffstat (limited to 'mysql-test/main/explain.result')
| -rw-r--r-- | mysql-test/main/explain.result | 409 |
1 files changed, 409 insertions, 0 deletions
diff --git a/mysql-test/main/explain.result b/mysql-test/main/explain.result new file mode 100644 index 00000000000..f593e0dfaba --- /dev/null +++ b/mysql-test/main/explain.result @@ -0,0 +1,409 @@ +drop table if exists t1; +create table t1 (id int not null, str char(10), unique(str)); +explain select * from t1; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 system NULL NULL NULL NULL 0 Const row not found +insert into t1 values (1, null),(2, null),(3, "foo"),(4, "bar"); +select * from t1 where str is null; +id str +1 NULL +2 NULL +select * from t1 where str="foo"; +id str +3 foo +explain select * from t1 where str is null; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ref str str 11 const 1 Using index condition +explain select * from t1 where str="foo"; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 const str str 11 const 1 +explain select * from t1 ignore key (str) where str="foo"; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ALL NULL NULL NULL NULL 4 Using where +explain select * from t1 use key (str,str) where str="foo"; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 const str str 11 const 1 +explain select * from t1 use key (str,str,foo) where str="foo"; +ERROR 42000: Key 'foo' doesn't exist in table 't1' +explain select * from t1 ignore key (str,str,foo) where str="foo"; +ERROR 42000: Key 'foo' doesn't exist in table 't1' +drop table t1; +explain select 1; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used +create table t1 (a int not null); +explain select count(*) from t1; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away +insert into t1 values(1); +explain select count(*) from t1; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away +insert into t1 values(1); +explain select count(*) from t1; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away +drop table t1; +set names koi8r; +create table таб (кол0 int, кол1 int, key инд0 (кол0), key инд01 (кол0,кол1)); +insert into таб (кол0) values (1); +insert into таб (кол0) values (2); +explain select кол0 from таб where кол0=1; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE таб ref инд0,инд01 инд0 5 const 1 Using index +drop table таб; +set names latin1; +select 3 into @v1; +explain select 3 into @v1; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used +create table t1(f1 int, f2 int); +insert into t1 values (1,1); +create view v1 as select * from t1 where f1=1; +explain extended select * from v1 where f2=1; +id select_type table type possible_keys key key_len ref rows filtered Extra +1 SIMPLE t1 system NULL NULL NULL NULL 1 100.00 +Warnings: +Note 1003 select 1 AS `f1`,1 AS `f2` from dual where 1 +explain extended select * from t1 where 0; +id select_type table type possible_keys key key_len ref rows filtered Extra +1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE +Warnings: +Note 1003 select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f2` AS `f2` from `test`.`t1` where 0 +explain extended select * from t1 where 1; +id select_type table type possible_keys key key_len ref rows filtered Extra +1 SIMPLE t1 system NULL NULL NULL NULL 1 100.00 +Warnings: +Note 1003 select 1 AS `f1`,1 AS `f2` from dual where 1 +explain extended select * from t1 having 0; +id select_type table type possible_keys key key_len ref rows filtered Extra +1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible HAVING +Warnings: +Note 1003 select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f2` AS `f2` from `test`.`t1` having 0 +explain extended select * from t1 having 1; +id select_type table type possible_keys key key_len ref rows filtered Extra +1 SIMPLE t1 system NULL NULL NULL NULL 1 100.00 +Warnings: +Note 1003 select 1 AS `f1`,1 AS `f2` from dual having 1 +drop view v1; +drop table t1; +CREATE TABLE t1(c INT); +INSERT INTO t1 VALUES (),(); +CREATE TABLE t2 (b INT, +KEY(b),KEY(b),KEY(b),KEY(b),KEY(b), +KEY(b),KEY(b),KEY(b),KEY(b),KEY(b), +KEY(b),KEY(b),KEY(b),KEY(b),KEY(b), +KEY(b),KEY(b),KEY(b),KEY(b),KEY(b), +KEY(b),KEY(b),KEY(b),KEY(b),KEY(b), +KEY(b),KEY(b),KEY(b),KEY(b),KEY(b), +KEY(b),KEY(b),KEY(b),KEY(b),KEY(b), +KEY(b),KEY(b),KEY(b),KEY(b),KEY(b)); +Warnings: +Note 1831 Duplicate index `b_2`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_3`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_4`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_5`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_6`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_7`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_8`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_9`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_10`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_11`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_12`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_13`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_14`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_15`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_16`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_17`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_18`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_19`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_20`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_21`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_22`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_23`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_24`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_25`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_26`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_27`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_28`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_29`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_30`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_31`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_32`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_33`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_34`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_35`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_36`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_37`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_38`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_39`. This is deprecated and will be disallowed in a future release +Note 1831 Duplicate index `b_40`. This is deprecated and will be disallowed in a future release +INSERT INTO t2 VALUES (),(),(); +EXPLAIN SELECT 1 FROM +(SELECT 1 FROM t2,t1 WHERE b < c GROUP BY 1 LIMIT 1) AS d2; +id select_type table type possible_keys key key_len ref rows Extra +X X X X X X X X X +X X X X X X X X X +X X X X X X X X X Range checked for each record (index map: 0xFFFFFFFFFF) +DROP TABLE t2; +DROP TABLE t1; +CREATE TABLE t1(a INT); +CREATE TABLE t2(a INT); +INSERT INTO t1 VALUES (1),(2); +INSERT INTO t2 VALUES (1),(2); +EXPLAIN EXTENDED SELECT 1 +FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1; +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 2 100.00 Using temporary; Using filesort +2 DERIVED t2 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join) +Warnings: +Note 1003 /* select#1 */ select 1 AS `1` from (/* select#2 */ select count(distinct `test`.`t1`.`a`) AS `COUNT(DISTINCT t1.a)` from `test`.`t1` join `test`.`t2` group by `test`.`t1`.`a`) `s1` +EXPLAIN EXTENDED SELECT 1 +FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1; +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 2 100.00 Using temporary; Using filesort +2 DERIVED t2 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join) +Warnings: +Note 1003 /* select#1 */ select 1 AS `1` from (/* select#2 */ select count(distinct `test`.`t1`.`a`) AS `COUNT(DISTINCT t1.a)` from `test`.`t1` join `test`.`t2` group by `test`.`t1`.`a`) `s1` +prepare s1 from +'EXPLAIN EXTENDED SELECT 1 + FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1'; +execute s1; +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 2 100.00 Using temporary; Using filesort +2 DERIVED t2 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join) +Warnings: +Note 1003 /* select#1 */ select 1 AS `1` from (/* select#2 */ select count(distinct `test`.`t1`.`a`) AS `COUNT(DISTINCT t1.a)` from `test`.`t1` join `test`.`t2` group by `test`.`t1`.`a`) `s1` +prepare s1 from +'EXPLAIN EXTENDED SELECT 1 + FROM (SELECT COUNT(DISTINCT t1.a) FROM t1,t2 GROUP BY t1.a) AS s1'; +execute s1; +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 2 100.00 Using temporary; Using filesort +2 DERIVED t2 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join) +Warnings: +Note 1003 /* select#1 */ select 1 AS `1` from (/* select#2 */ select count(distinct `test`.`t1`.`a`) AS `COUNT(DISTINCT t1.a)` from `test`.`t1` join `test`.`t2` group by `test`.`t1`.`a`) `s1` +execute s1; +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 2 100.00 Using temporary; Using filesort +2 DERIVED t2 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join) +Warnings: +Note 1003 /* select#1 */ select 1 AS `1` from (/* select#2 */ select count(distinct `test`.`t1`.`a`) AS `COUNT(DISTINCT t1.a)` from `test`.`t1` join `test`.`t2` group by `test`.`t1`.`a`) `s1` +DROP TABLE t1,t2; +CREATE TABLE t1 (a INT PRIMARY KEY); +EXPLAIN EXTENDED SELECT COUNT(a) FROM t1 USE KEY(a); +ERROR 42000: Key 'a' doesn't exist in table 't1' +DROP TABLE t1; +CREATE TABLE t1(a LONGTEXT); +INSERT INTO t1 VALUES (repeat('a',@@global.max_allowed_packet)); +INSERT INTO t1 VALUES (repeat('b',@@global.max_allowed_packet)); +EXPLAIN SELECT DISTINCT 1 FROM t1, +(SELECT DISTINCTROW a AS away FROM t1 GROUP BY a WITH ROLLUP) as d1 +WHERE t1.a = d1.a; +ERROR 42S22: Unknown column 'd1.a' in 'where clause' +DROP TABLE t1; +# +# Bug#48295: +# explain extended crash with subquery and ONLY_FULL_GROUP_BY sql_mode +# +CREATE TABLE t1 (f1 INT not null); +SELECT @@session.sql_mode INTO @old_sql_mode; +SET SESSION sql_mode='ONLY_FULL_GROUP_BY'; +EXPLAIN EXTENDED SELECT 1 FROM t1 +WHERE f1 > ALL( SELECT t.f1 FROM t1,t1 AS t ); +id select_type table type possible_keys key key_len ref rows filtered Extra +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables +2 SUBQUERY t1 system NULL NULL NULL NULL 0 0.00 Const row not found +2 SUBQUERY t system NULL NULL NULL NULL 0 0.00 Const row not found +Warnings: +Note 1003 /* select#1 */ select 1 AS `1` from `test`.`t1` where 0 +SET SESSION sql_mode=@old_sql_mode; +DROP TABLE t1; +End of 5.0 tests. +# +# Bug#37870: Usage of uninitialized value caused failed assertion. +# +create table t1 (dt datetime not null, t time not null); +create table t2 (dt datetime not null); +insert into t1 values ('2001-01-01 1:1:1', '1:1:1'), +('2001-01-01 1:1:1', '1:1:1'); +insert into t2 values ('2001-01-01 1:1:1'), ('2001-01-01 1:1:1'); +SET @save_join_cache_level=@@join_cache_level; +SET join_cache_level=0; +flush tables; +EXPLAIN SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN (SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.dt IS NULL ); +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY OUTR ALL NULL NULL NULL NULL 2 Using where +1 PRIMARY INNR ALL NULL NULL NULL NULL 2 Using where; FirstMatch(OUTR) +flush tables; +SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN (SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.dt IS NULL ); +dt +flush tables; +EXPLAIN SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN ( SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.t < '2005-11-13 7:41:31' ); +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY OUTR ALL NULL NULL NULL NULL 2 Using where +1 PRIMARY INNR ALL NULL NULL NULL NULL 2 Using where; FirstMatch(OUTR) +flush tables; +SELECT OUTR.dt FROM t1 AS OUTR WHERE OUTR.dt IN ( SELECT INNR.dt FROM t2 AS INNR WHERE OUTR.t < '2005-11-13 7:41:31' ); +dt +2001-01-01 01:01:01 +2001-01-01 01:01:01 +SET join_cache_level=@save_join_cache_level; +drop tables t1, t2; +# +# Bug#47669: Query showed by EXPLAIN EXTENDED gives different result from original query +# +CREATE TABLE t1 (c int); +INSERT INTO t1 VALUES (NULL); +CREATE TABLE t2 (d int); +INSERT INTO t2 VALUES (NULL), (0); +EXPLAIN EXTENDED SELECT (SELECT 1 FROM t2 WHERE d = c) FROM t1; +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 +2 SUBQUERY t2 ALL NULL NULL NULL NULL 2 100.00 Using where +Warnings: +Note 1276 Field or reference 'test.t1.c' of SELECT #2 was resolved in SELECT #1 +Note 1003 /* select#1 */ select (/* select#2 */ select 1 from `test`.`t2` where `test`.`t2`.`d` = NULL) AS `(SELECT 1 FROM t2 WHERE d = c)` from dual +DROP TABLE t1, t2; +# +# Bug#30302: Tables that were optimized away are printed in the +# EXPLAIN EXTENDED warning. +# +create table t1(f1 int); +create table t2(f2 int); +insert into t1 values(1); +insert into t2 values(1),(2); +explain extended select * from t1 where f1=1; +id select_type table type possible_keys key key_len ref rows filtered Extra +1 SIMPLE t1 system NULL NULL NULL NULL 1 100.00 +Warnings: +Note 1003 select 1 AS `f1` from dual where 1 +explain extended select * from t1 join t2 on f1=f2 where f1=1; +id select_type table type possible_keys key key_len ref rows filtered Extra +1 SIMPLE t1 system NULL NULL NULL NULL 1 100.00 +1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00 Using where +Warnings: +Note 1003 select 1 AS `f1`,`test`.`t2`.`f2` AS `f2` from `test`.`t2` where `test`.`t2`.`f2` = 1 +drop table t1,t2; +# +# Bug #48419: another explain crash.. +# +CREATE TABLE t1 (a INT); +CREATE TABLE t2 (b BLOB, KEY b(b(100))); +INSERT INTO t2 VALUES ('1'), ('2'), ('3'); +FLUSH TABLES; +EXPLAIN SELECT 1 FROM t1 WHERE a = (SELECT 1 FROM t1 t JOIN t2 WHERE b <= 1 AND t.a); +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables +2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table +DROP TABLE t1, t2; +# +# Bug #48573: difference of index selection between rpm binary and +# .tar.gz, windows vs linux.. +# +CREATE TABLE t1(c1 INT, c2 INT, c4 INT, c5 INT, KEY(c2, c5), KEY(c2, c4, c5)); +INSERT INTO t1 VALUES(4, 1, 1, 1); +INSERT INTO t1 VALUES(3, 1, 1, 1); +INSERT INTO t1 VALUES(2, 1, 1, 1); +INSERT INTO t1 VALUES(1, 1, 1, 1); +EXPLAIN SELECT c1 FROM t1 WHERE c2 = 1 AND c4 = 1 AND c5 = 1; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 ref c2,c2_2 c2 10 const,const 3 Using where +DROP TABLE t1; +# +# Bug#56814 Explain + subselect + fulltext crashes server +# +CREATE TABLE t1(f1 VARCHAR(6) NOT NULL, +FULLTEXT KEY(f1),UNIQUE(f1)); +INSERT INTO t1 VALUES ('test'); +EXPLAIN SELECT 1 FROM t1 +WHERE 1 > ALL((SELECT t1.f1 FROM t1 JOIN t1 a ON (MATCH(t1.f1) AGAINST ("")) +WHERE t1.f1 GROUP BY t1.f1)); +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 system NULL NULL NULL NULL 1 +2 SUBQUERY a system NULL NULL NULL NULL 1 +2 SUBQUERY t1 fulltext f1_2,f1 f1 0 1 Using where +PREPARE stmt FROM +'EXPLAIN SELECT 1 FROM t1 + WHERE 1 > ALL((SELECT t1.f1 FROM t1 RIGHT OUTER JOIN t1 a + ON (MATCH(t1.f1) AGAINST ("")) + WHERE t1.f1 GROUP BY t1.f1))'; +EXECUTE stmt; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 system NULL NULL NULL NULL 1 +2 SUBQUERY a system NULL NULL NULL NULL 1 +2 SUBQUERY t1 fulltext f1_2,f1 f1 0 1 Using where +EXECUTE stmt; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 system NULL NULL NULL NULL 1 +2 SUBQUERY a system NULL NULL NULL NULL 1 +2 SUBQUERY t1 fulltext f1_2,f1 f1 0 1 Using where +DEALLOCATE PREPARE stmt; +PREPARE stmt FROM +'EXPLAIN SELECT 1 FROM t1 + WHERE 1 > ALL((SELECT t1.f1 FROM t1 JOIN t1 a + ON (MATCH(t1.f1) AGAINST ("")) + WHERE t1.f1 GROUP BY t1.f1))'; +EXECUTE stmt; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 system NULL NULL NULL NULL 1 +2 SUBQUERY a system NULL NULL NULL NULL 1 +2 SUBQUERY t1 fulltext f1_2,f1 f1 0 1 Using where +EXECUTE stmt; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t1 system NULL NULL NULL NULL 1 +2 SUBQUERY a system NULL NULL NULL NULL 1 +2 SUBQUERY t1 fulltext f1_2,f1 f1 0 1 Using where +DEALLOCATE PREPARE stmt; +DROP TABLE t1; +End of 5.1 tests. +# +# Bug#11829785 EXPLAIN EXTENDED CRASH WITH RIGHT OUTER JOIN, SUBQUERIES +# +CREATE TABLE t1(a INT); +INSERT INTO t1 VALUES (0), (0); +PREPARE s FROM +'EXPLAIN EXTENDED +SELECT SUBSTRING(1, (SELECT 1 FROM t1 a1 RIGHT OUTER JOIN t1 ON 0)) AS d +FROM t1 WHERE 0 > ANY (SELECT @a FROM t1)'; +EXECUTE s; +ERROR 21000: Subquery returns more than 1 row +DEALLOCATE PREPARE s; +DROP TABLE t1; +# +# Bug#776295: EXPLAIN EXTENDED with always false multiple equality +# in the WHERE condition of a derived table +# +CREATE TABLE t1 (a int) ; +CREATE TABLE t2 (a int) ; +INSERT INTO t2 VALUES (8); +set @tmp_optimizer_switch=@@optimizer_switch; +set optimizer_switch='derived_merge=off,derived_with_keys=off'; +EXPLAIN EXTENDED +SELECT * FROM ( SELECT t1.a FROM t1,t2 WHERE t2.a = t1.a ) AS t; +id select_type table type possible_keys key key_len ref rows filtered Extra +1 PRIMARY <derived2> system NULL NULL NULL NULL 0 0.00 Const row not found +2 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table +Warnings: +Note 1003 /* select#1 */ select NULL AS `a` from (/* select#2 */ select NULL AS `a` from `test`.`t1` where 0) `t` +set optimizer_switch=@tmp_optimizer_switch; +DROP TABLE t1,t2; +# +# MDEV-7215: EXPLAIN REPLACE produces an error: +# Column count doesn't match value count +# +create table t1 (a int); +insert into t1 values (1); +create table t2 (b int, c int); +replace into t2 select 100, (select a from t1); +explain replace into t2 select 100, (select a from t1); +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 SUBQUERY t1 system NULL NULL NULL NULL 1 +drop table t1, t2; +# End of 10.1 tests |