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Fix bug mdev-447: Wrong output from the EXPLAIN command of the test case for lp bug #714999

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The fix backports from MWL#182: Explain running statements the logic that
saves the original JOIN_TAB array of a query plan after optimization. This
array is later used during EXPLAIN to iterate over the original JOIN plan
nodes in the cases when this plan could be changed by early subquery
execution during the optimization phase of the outer query.
This commit is contained in:
unknown
2012-08-21 15:24:43 +03:00
parent a45c451e40
commit 80b3f74705
9 changed files with 52 additions and 31 deletions
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4
mysql-test/r/subselect_innodb.result
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@@ -333,7 +333,7 @@ WHERE (SELECT DISTINCT b FROM t3) > 0);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 const PRIMARY PRIMARY 4 const 1 Using where; Using index
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
3 SUBQUERY internal_tmp_table ALL group_key NULL NULL NULL 0 Using temporary
3 SUBQUERY t3 ALL NULL NULL NULL NULL 1 Using temporary
SELECT *
FROM t1
WHERE t1.a = (
@@ -386,7 +386,7 @@ select 1 from t1 where 1 like (select 1 from t1 where 1 <=> (select 1 from t1 gr
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 1
2 SUBQUERY t1 ALL NULL NULL NULL NULL 1
3 SUBQUERY internal_tmp_table ALL group_key NULL NULL NULL 1 Using temporary; Using filesort
3 SUBQUERY t1 ALL NULL NULL NULL NULL 1 Using temporary; Using filesort
select 1 from t1 where 1 like (select 1 from t1 where 1 <=> (select 1 from t1 group by a1));
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