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FIxed bug #14927.

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A query with a group by and having clauses could return a wrong
result set if the having condition contained a constant conjunct 
evaluated to FALSE.
It happened because the pushdown condition for table with
grouping columns lost its constant conjuncts.
Pushdown conditions are always built by the function make_cond_for_table
that ignores constant conjuncts. This is apparently not correct when
constant false conjuncts are present.
This commit is contained in:
igor@rurik.mysql.com
2006-01-31 21:48:32 -08:00
parent 7e5108392d
commit d6370b48a7
6 changed files with 57 additions and 11 deletions
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17
mysql-test/r/having.result
View File

@ -141,3 +141,20 @@ SUM(a)
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4
DROP TABLE t1;
CREATE TABLE t1 (a int);
INSERT INTO t1 VALUES (1), (2), (1), (3), (2), (1);
SELECT a FROM t1 GROUP BY a HAVING a > 1;
a
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3
SELECT a FROM t1 GROUP BY a HAVING 1 != 1 AND a > 1;
a
SELECT 0 AS x, a FROM t1 GROUP BY x,a HAVING x=1 AND a > 1;
x a
EXPLAIN SELECT a FROM t1 GROUP BY a HAVING 1 != 1 AND a > 1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible HAVING
EXPLAIN SELECT 0 AS x, a FROM t1 GROUP BY x,a HAVING x=1 AND a > 1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible HAVING
DROP table t1;