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a52362b90c
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.
32 lines
859 B
Plaintext
32 lines
859 B
Plaintext
CREATE TABLE t1 (pk INT AUTO_INCREMENT PRIMARY KEY, a varchar(30000), UNIQUE (a)) ENGINE=innodb;
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INSERT INTO t1 (a) VALUES (20),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL);
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SELECT * FROM t1 WHERE a BETWEEN '1' AND '100';
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pk a
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DROP TABLE t1;
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CREATE TABLE t2 (n BLOB, UNIQUE(n));
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INSERT INTO t2 VALUES (1);
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DELETE FROM t2 WHERE n = 1;
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DROP TABLE t2;
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#
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# Beginning of 11.4 tests
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#
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#
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# MDEV-36389
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#
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CREATE TABLE t1 (c1 TEXT, UNIQUE (c1(1)));
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INSERT INTO t1 (c1) VALUES ('a');
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SELECT c1 FROM t1 WHERE ('abc' IN (SELECT c1 FROM t1)) IS FALSE;
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c1
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a
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DROP TABLE t1;
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CREATE TABLE t0 (c1 text not null);
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insert into t0 values ('abc'),('abc');
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CREATE TABLE t1 (c1 TEXT, UNIQUE (c1(1))) engine=myisam;
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INSERT INTO t1 (c1) VALUES ('a'),('b'),('c');
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SELECT c1, c1 IN (SELECT c1 FROM t1) FROM t0;
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c1 c1 IN (SELECT c1 FROM t1)
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abc 0
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abc 0
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DROP TABLE t0, t1;
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# End of 11.4 tests
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