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Fixed LP bug #776295.

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If the value of the flag cond_false of an Item_equal object is
true then the print method must return the string '0'.
This commit is contained in:
Igor Babaev
2011-05-04 18:08:44 -07:00
parent e3e2358fd2
commit 20c9084deb
5 changed files with 38 additions and 2 deletions
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15
mysql-test/r/explain.result
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@ -298,3 +298,18 @@ id select_type table type possible_keys key key_len ref rows Extra
DEALLOCATE PREPARE stmt;
DROP TABLE t1;
End of 5.1 tests.
#
# Bug#776295: EXPLAIN EXTENDED with always false multiple equality
# in the WHERE condition of a derived table
#
CREATE TABLE t1 (a int) ;
CREATE TABLE t2 (a int) ;
INSERT INTO t2 VALUES (8);
EXPLAIN EXTENDED
SELECT * FROM ( SELECT t1.a FROM t1,t2 WHERE t2.a = t1.a ) AS t;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <derived2> system NULL NULL NULL NULL 0 0.00 const row not found
2 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table
Warnings:
Note 1003 select NULL AS `a` from (select NULL AS `a` from `test`.`t1` join `test`.`t2` where 0) `t`
DROP TABLE t1,t2;