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Fix for Bug #9246 Condition pushdown and left join, wrong result

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unknown
2005-05-09 18:56:29 +02:00
parent 848611b5ed
commit 9e04ebfa99
3 changed files with 10 additions and 1 deletions
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5
mysql-test/r/ndb_condition_pushdown.result
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@ -1139,5 +1139,10 @@ explain
select * from t2 where (attr1 < 2) = (attr2 < 2) order by pk1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 6 Using where; Using filesort
explain
select * from t3 left join t4 on t4.attr2 = t3.attr2 where t4.attr1 > 1 and t4.attr3 < 5 or t4.attr1 is null order by t4.pk1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 ALL NULL NULL NULL NULL 6 Using temporary; Using filesort
1 SIMPLE t4 ALL NULL NULL NULL NULL 6 Using where
set engine_condition_pushdown = @old_ecpd;
DROP TABLE t1,t2,t3,t4;

2
mysql-test/t/ndb_condition_pushdown.test
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@ -1044,6 +1044,8 @@ explain
select auto from t1 where string = "aaaa" collate latin1_general_ci order by auto;
explain
select * from t2 where (attr1 < 2) = (attr2 < 2) order by pk1;
explain
select * from t3 left join t4 on t4.attr2 = t3.attr2 where t4.attr1 > 1 and t4.attr3 < 5 or t4.attr1 is null order by t4.pk1;
set engine_condition_pushdown = @old_ecpd;
DROP TABLE t1,t2,t3,t4;

4
sql/sql_select.cc
View File

@ -5401,10 +5401,12 @@ make_join_select(JOIN *join,SQL_SELECT *select,COND *cond)
if (!(tmp= add_found_match_trig_cond(first_inner_tab, tmp, 0)))
DBUG_RETURN(1);
tab->select_cond=sel->cond=tmp;
/* Push condition to storage engine if this is enabled
and the condition is not guarded */
if (thd->variables.engine_condition_pushdown)
{
COND *push_cond=
make_cond_for_table(cond,current_map,current_map);
make_cond_for_table(tmp,current_map,current_map);
tab->table->file->pushed_cond= NULL;
if (push_cond)
{