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MDEV-21029 Incorrect result for expression with the <=> operator and IS NULL

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Item_func_equal erroneously derived is_null() from the parent class.
Overriding it to return false because <=> can never return NULL.
This commit is contained in:
Alexander Barkov
2024-11-12 11:06:32 +04:00
parent 773cb726a8
commit 2e404c9850
3 changed files with 27 additions and 0 deletions
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15
mysql-test/main/func_equal.test
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@@ -44,3 +44,18 @@ select * from t1 where a in ('4828532208463511553');
drop table t1;
--echo #End of 4.1 tests
--echo # Start of 10.5 tests
--echo #
--echo # MDEV-21029 Incorrect result for expression with the <=> operator and IS NULL
--echo #
CREATE TABLE t0(c0 INT);
INSERT INTO t0 VALUES (1);
SELECT (c0 > (NULL <=> 0)) IS NULL AS c1 FROM t0;
DROP TABLE t0;
--echo # End of 10.5 tests