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Merge remote-tracking branch 'origin/5.5' into 10.0

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Vicențiu Ciorbaru
2017-05-17 15:42:36 +03:00
parent b87873b221 934b831281
commit 339a290d22
19 changed files with 452 additions and 19 deletions
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80
sql/opt_subselect.cc
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@@ -1001,6 +1001,25 @@ bool check_for_outer_joins(List<TABLE_LIST> *join_list)
}
void find_and_block_conversion_to_sj(Item *to_find,
List_iterator_fast<Item_in_subselect> &li)
{
if (to_find->type() != Item::SUBSELECT_ITEM ||
((Item_subselect *) to_find)->substype() != Item_subselect::IN_SUBS)
return;
Item_in_subselect *in_subq;
li.rewind();
while ((in_subq= li++))
{
if (in_subq == to_find)
{
in_subq->block_conversion_to_sj();
return;
}
}
}
/*
Convert semi-join subquery predicates into semi-join join nests
@@ -1053,7 +1072,6 @@ bool convert_join_subqueries_to_semijoins(JOIN *join)
Query_arena *arena, backup;
Item_in_subselect *in_subq;
THD *thd= join->thd;
List_iterator<TABLE_LIST> ti(join->select_lex->leaf_tables);
DBUG_ENTER("convert_join_subqueries_to_semijoins");
if (join->select_lex->sj_subselects.is_empty())
@@ -1071,6 +1089,60 @@ bool convert_join_subqueries_to_semijoins(JOIN *join)
subq_sel->update_used_tables();
}
/*
Check all candidates to semi-join conversion that occur
in ON expressions of outer join. Set the flag blocking
this conversion for them.
*/
TABLE_LIST *tbl;
List_iterator<TABLE_LIST> ti(join->select_lex->leaf_tables);
while ((tbl= ti++))
{
TABLE_LIST *embedded;
TABLE_LIST *embedding= tbl;
do
{
embedded= embedding;
if (MY_TEST(embedded->outer_join))
{
Item *cond= embedded->on_expr;
if (!cond)
;
else if (cond->type() != Item::COND_ITEM)
find_and_block_conversion_to_sj(cond, li);
else if (((Item_cond*) cond)->functype() ==
Item_func::COND_AND_FUNC)
{
Item *item;
List_iterator<Item> it(*(((Item_cond*) cond)->argument_list()));
while ((item= it++))
{
find_and_block_conversion_to_sj(item, li);
}
}
}
embedding= embedded->embedding;
}
while (embedding &&
embedding->nested_join->join_list.head() == embedded);
}
/*
Block conversion to semi-joins for those candidates that
are encountered in the WHERE condition of the multi-table view
with CHECK OPTION if this view is used in UPDATE/DELETE.
(This limitation can be, probably, easily lifted.)
*/
li.rewind();
while ((in_subq= li++))
{
if (in_subq->emb_on_expr_nest != NO_JOIN_NEST &&
in_subq->emb_on_expr_nest->effective_with_check)
{
in_subq->block_conversion_to_sj();
}
}
li.rewind();
/* First, convert child join's subqueries. We proceed bottom-up here */
while ((in_subq= li++))
@@ -1089,8 +1161,10 @@ bool convert_join_subqueries_to_semijoins(JOIN *join)
if (convert_join_subqueries_to_semijoins(child_join))
DBUG_RETURN(TRUE);
in_subq->sj_convert_priority=
MY_TEST(in_subq->emb_on_expr_nest != NO_JOIN_NEST) * MAX_TABLES * 2 +
MY_TEST(in_subq->do_not_convert_to_sj) * MAX_TABLES * 2 +
in_subq->is_correlated * MAX_TABLES + child_join->outer_tables;
}
@@ -1123,7 +1197,7 @@ bool convert_join_subqueries_to_semijoins(JOIN *join)
bool remove_item= TRUE;
/* Stop processing if we've reached a subquery that's attached to the ON clause */
if (in_subq->emb_on_expr_nest != NO_JOIN_NEST)
if (in_subq->do_not_convert_to_sj)
break;
if (in_subq->is_flattenable_semijoin)