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Fixed bug mdev-4274.

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This bug was the result of incompleteness of the patch for bug mdev-4177.
When an OR condition is simplified to a single conjunct it is merged
into the embedding AND condition. Multiple equalities are also merged,
and any field item involved in those equality should acquire a pointer
to a the multiple equality formed by this merge.
This commit is contained in:
Igor Babaev
2013-04-29 20:31:40 -07:00
parent ea4a417a8d
commit 86f43c3077
6 changed files with 161 additions and 2 deletions
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35
mysql-test/r/select.result
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@ -5049,6 +5049,7 @@ SELECT 1 FROM t1 GROUP BY 1;
1
1
drop table t1;
set sql_buffer_result= 0;
End of 5.1 tests
#
# BUG#776274: substitution of a single row table
@ -5132,4 +5133,38 @@ AND Time_zone_id = Time_zone_id
OR Time_zone_id <> Time_zone_id )
AND Use_leap_seconds <> 'N';
Time_zone_id Use_leap_seconds
#
# Bug mdev-4274: result of simplification of OR badly merged
# into embedding AND
#
CREATE TABLE t1 (a int, b int, INDEX idx(b)) ENGINE=MyISAM;
INSERT INTO t1 VALUES (8,8);
CREATE TABLE t2 (c int, INDEX idx(c)) ENGINE=MyISAM;
INSERT INTO t2 VALUES (8), (9);
EXPLAIN EXTENDED
SELECT * FROM t1 INNER JOIN t2 ON ( c = a )
WHERE 1 IS NULL OR b < 33 AND b = c;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 system idx NULL NULL NULL 1 100.00
1 SIMPLE t2 ref idx idx 5 const 1 100.00 Using index
Warnings:
Note 1003 select 8 AS `a`,8 AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`c` = 8) and (8 < 33))
SELECT * FROM t1 INNER JOIN t2 ON ( c = a )
WHERE 1 IS NULL OR b < 33 AND b = c;
a b c
8 8 8
DROP TABLE t1,t2;
#
# Bug mdev-4413: another manifestations of bug mdev-2474
# (valgrind complains)
#
CREATE TABLE t1 (a int, b int) ENGINE=MyISAM;
INSERT INTO t1 VALUES (7,1);
CREATE TABLE t2 (c int) ENGINE=MyISAM;
INSERT INTO t2 VALUES (0), (8);
SELECT * FROM t1, t2
WHERE c = a AND
( 0 OR ( b BETWEEN 45 AND 300 OR a > 45 AND a < 100 ) AND b = c );
a b c
DROP TABLE t1, t2;
End of 5.3 tests