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MDEV-36389 Incorrect query results for an indexed text column

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Fixes a scenario where an IN subquery returned the wrong result
because the pushed WHERE clause was not retained for downstream
result filtering.  For example:
  CREATE TABLE t1 (c1 TEXT, UNIQUE (c1(1)));
  INSERT INTO t1 (c1) VALUES ('a');
  SELECT 'abc' IN (SELECT c1 FROM t1);
Internally, he 'abc' IN subquery condition becomes the constant
condition:
  'abc' = t1.c1 or t1.c1 is null
Prior to this patch, this condition was incorrectly removed when
converting the subquery engine to an index lookup-based engine.
Now eligible conditions are preserved during such engine rewrites.
This commit is contained in:
Sergei Petrunia
2025-07-23 15:40:53 +03:00
committed by Dave Gosselin
parent 3109d994eb
commit a52362b90c
21 changed files with 201 additions and 119 deletions
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23
mysql-test/main/unique.test
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@@ -20,3 +20,26 @@ CREATE TABLE t2 (n BLOB, UNIQUE(n));
INSERT INTO t2 VALUES (1);
DELETE FROM t2 WHERE n = 1;
DROP TABLE t2;
--echo #
--echo # Beginning of 11.4 tests
--echo #
--echo #
--echo # MDEV-36389
--echo #
CREATE TABLE t1 (c1 TEXT, UNIQUE (c1(1)));
INSERT INTO t1 (c1) VALUES ('a');
SELECT c1 FROM t1 WHERE ('abc' IN (SELECT c1 FROM t1)) IS FALSE;
DROP TABLE t1;
CREATE TABLE t0 (c1 text not null);
insert into t0 values ('abc'),('abc');
CREATE TABLE t1 (c1 TEXT, UNIQUE (c1(1))) engine=myisam;
INSERT INTO t1 (c1) VALUES ('a'),('b'),('c');
SELECT c1, c1 IN (SELECT c1 FROM t1) FROM t0;
DROP TABLE t0, t1;
--echo # End of 11.4 tests