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Fixed bug #57024.

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The condition over the outer tables now are extracted from
the on condition of any outer join. This condition is
saved in a special field of the JOIN_TAB structure for
the first inner table of the outer join. The condition
is checked before the first inner table is accessed. If 
it turns out to be false the table is not accessed at all
and a null complemented row is generated immediately.
This commit is contained in:
Igor Babaev
2010-09-26 09:12:34 -07:00
parent d91422f03a
commit 716e84164a
4 changed files with 124 additions and 11 deletions
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4
sql/sql_select.h
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@ -154,7 +154,9 @@ typedef struct st_join_table {
TABLE *table;
KEYUSE *keyuse; /**< pointer to first used key */
SQL_SELECT *select;
COND *select_cond;
COND *select_cond;
COND *on_precond; /**< part of on condition to check before
accessing the first inner table */
QUICK_SELECT_I *quick;
Item **on_expr_ref; /**< pointer to the associated on expression */
COND_EQUAL *cond_equal; /**< multiple equalities for the on expression */