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Fixed bug mdev-5635.

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After constant row substitution some field items become constant items.
The range analyzer should take into account this fact when looking for
ranges.
This commit is contained in:
Igor Babaev
2014-02-27 13:54:05 -08:00
parent 472bc477f6
commit 1a536c8daf
3 changed files with 30 additions and 2 deletions
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11
mysql-test/r/join.result
View File

@ -1538,3 +1538,14 @@ a
3
4
DROP TABLE t1,t2;
#
# MDEV-5635: join of a const table with non-const tables
#
CREATE TABLE t1 (a varchar(3) NOT NULL) ENGINE=MyISAM;
INSERT INTO t1 VALUES ('foo');
CREATE TABLE t2 (b varchar(3), c varchar(3), INDEX(b)) ENGINE=MyISAM;
INSERT INTO t2 VALUES ('bar', 'bar'),( 'qux', 'qux');
SELECT STRAIGHT_JOIN * FROM t1, t2 AS t2_1, t2 AS t2_2
WHERE t2_2.c = t2_1.c AND t2_2.b = t2_1.b AND ( a IS NULL OR t2_1.c = a );
a b c b c
DROP TABLE t1,t2;

15
mysql-test/t/join.test
View File

@ -1185,3 +1185,18 @@ SELECT t1.a FROM t1 NATURAL STRAIGHT_JOIN t2 ORDER BY t1.a;
SELECT t1.a FROM t1 NATURAL STRAIGHT_JOIN t2 ORDER BY t1.a;
DROP TABLE t1,t2;
--echo #
--echo # MDEV-5635: join of a const table with non-const tables
--echo #
CREATE TABLE t1 (a varchar(3) NOT NULL) ENGINE=MyISAM;
INSERT INTO t1 VALUES ('foo');
CREATE TABLE t2 (b varchar(3), c varchar(3), INDEX(b)) ENGINE=MyISAM;
INSERT INTO t2 VALUES ('bar', 'bar'),( 'qux', 'qux');
SELECT STRAIGHT_JOIN * FROM t1, t2 AS t2_1, t2 AS t2_2
WHERE t2_2.c = t2_1.c AND t2_2.b = t2_1.b AND ( a IS NULL OR t2_1.c = a );
DROP TABLE t1,t2;

2
sql/opt_range.cc
View File

@ -7941,6 +7941,7 @@ static SEL_TREE *get_mm_tree(RANGE_OPT_PARAM *param,COND *cond)
value= cond_func->arg_count > 1 ? cond_func->arguments()[1] : NULL;
if (value && value->is_expensive())
DBUG_RETURN(0);
if (!cond_func->arguments()[0]->real_item()->const_item())
ftree= get_full_func_mm_tree(param, cond_func, field_item, value, inv);
}
/*
@ -7966,6 +7967,7 @@ static SEL_TREE *get_mm_tree(RANGE_OPT_PARAM *param,COND *cond)
value= cond_func->arguments()[0];
if (value && value->is_expensive())
DBUG_RETURN(0);
if (!cond_func->arguments()[1]->real_item()->const_item())
ftree= get_full_func_mm_tree(param, cond_func, field_item, value, inv);
}
}