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Manual merge.

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This commit is contained in:
Alexey Kopytov
2009-10-15 14:42:51 +04:00
parent cd69e34ca7 5db734a896
commit f98d11ee24
3 changed files with 31 additions and 0 deletions
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9
mysql-test/r/range.result
View File

@ -1398,3 +1398,12 @@ a < 10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 range a a 5 NULL 8 Using where; Using index
DROP TABLE t1, t2, t3;
#
# Bug #47123: Endless 100% CPU loop with STRAIGHT_JOIN
#
CREATE TABLE t1(a INT, KEY(a));
INSERT INTO t1 VALUES (1), (NULL);
SELECT * FROM t1 WHERE a <> NULL and (a <> NULL or a <= NULL);
a
DROP TABLE t1;
End of 5.1 tests

11
mysql-test/t/range.test
View File

@ -1171,3 +1171,14 @@ a < 5 OR
a < 10;
DROP TABLE t1, t2, t3;
--echo #
--echo # Bug #47123: Endless 100% CPU loop with STRAIGHT_JOIN
--echo #
CREATE TABLE t1(a INT, KEY(a));
INSERT INTO t1 VALUES (1), (NULL);
SELECT * FROM t1 WHERE a <> NULL and (a <> NULL or a <= NULL);
DROP TABLE t1;
--echo End of 5.1 tests

11
sql/opt_range.cc
View File

@ -5891,6 +5891,17 @@ get_mm_leaf(RANGE_OPT_PARAM *param, COND *conf_func, Field *field,
goto end;
}
field->table->in_use->variables.sql_mode= orig_sql_mode;
/*
Any sargable predicate except "<=>" involving NULL as a constant is always
FALSE
*/
if (type != Item_func::EQUAL_FUNC && field->is_real_null())
{
tree= &null_element;
goto end;
}
str= (uchar*) alloc_root(alloc, key_part->store_length+1);
if (!str)
goto end;