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Some code optimisations related to EXPLAIN of derived tables and the

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resulting code cleanup in our main loop.
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2002-11-09 15:40:46 +02:00
parent 826aa607ff
commit f980950bb3
6 changed files with 37 additions and 90 deletions
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mysql-test/r/subselect.result
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@@ -71,8 +71,8 @@ select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from
explain select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from
(select * from t2 where a>1) as tt;
id select_type table type possible_keys key key_len ref rows Extra
3 DERIVED t2 ALL NULL NULL NULL NULL 2 where used
1 PRIMARY <derived3> system NULL NULL NULL NULL 1
3 DERIVED t2 ALL NULL NULL NULL NULL 2 where used
2 SUBSELECT t3 ALL NULL NULL NULL NULL 3 where used; Using filesort
select * from t1 where t1.a=(select t2.a from t2 where t2.b=(select max(a) from t3) order by 1 desc limit 1);
a