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Backport of subquery optimizations to 5.3.

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There are still test failures because of:
- Wrong query results in outer join + semi join
- EXPLAIN output differences
This commit is contained in:
Sergey Petrunya 2010-01-17 17:51:10 +03:00
commit b83cb52e9e
57 changed files with 30851 additions and 628 deletions
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6
sql/opt_table_elimination.cc
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@ -725,7 +725,11 @@ eliminate_tables_for_list(JOIN *join, List<TABLE_LIST> *join_list,
}
else
{
DBUG_ASSERT(!tbl->nested_join);
DBUG_ASSERT(!tbl->nested_join || tbl->sj_on_expr);
//psergey-todo: is the following really correct or we'll need to descend
//down all ON clauses: ?
if (tbl->sj_on_expr)
tables_used_on_left |= tbl->sj_on_expr->used_tables();
}
}