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Fixed bug mdev-4025.

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The bug could lead to a wrong estimate of the number of expected rows
in the output of the EXPLAIN commands for queries with GROUP BY.
This could be observed in the test case for LP bug 934348.
This commit is contained in:
Igor Babaev
2013-01-11 20:26:34 -08:00
parent d8acafcbf2
commit 12bf6fe858
2 changed files with 5 additions and 4 deletions
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4
mysql-test/r/subselect_sj_jcl6.result
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@ -2978,7 +2978,7 @@ EXPLAIN
SELECT a FROM t1 t WHERE a IN (SELECT b FROM t1, t2 WHERE b = a)
GROUP BY a HAVING a != 'z';
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t index idx_a idx_a 4 NULL 1 Using index
1 PRIMARY t index idx_a idx_a 4 NULL 3 Using index
1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1
2 MATERIALIZED t2 ALL NULL NULL NULL NULL 2 Using where
2 MATERIALIZED t1 ref idx_a idx_a 4 test.t2.b 2 Using index
@ -2992,7 +2992,7 @@ EXPLAIN
SELECT a FROM t1 t WHERE a IN (SELECT b FROM t1, t2 WHERE b = a)
GROUP BY a HAVING a != 'z';
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t index idx_a idx_a 4 NULL 1 Using index
1 PRIMARY t index idx_a idx_a 4 NULL 3 Using index
1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1
2 MATERIALIZED t2 ALL NULL NULL NULL NULL 2 Using where
2 MATERIALIZED t1 ref idx_a idx_a 4 test.t2.b 2 Using index