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Fixed LP bug #953649.

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Do not call, directly or indirectly, SQL_SELECT::test_quick_select()
for derived materialized tables / views when optimizing joins referring
to these tables / views to get cost estimates of materialization.
The current code does not create B-tree indexes for materialized 
derived tables / views. So now it's not possible to get any estimates
for ranges conditions over the results of the materialization.

The function mysql_derived_create() must take into account the fact
that array of the KEY structures specifying the keys over a derived
table / view may be moved after the optimization phase if the
derived table / view  is materialized.
This commit is contained in:
Igor Babaev
2012-03-13 13:34:20 -07:00
parent 223483aedf
commit c1f5e25c04
4 changed files with 81 additions and 7 deletions
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14
sql/sql_select.cc
View File

@@ -3513,12 +3513,16 @@ make_join_statistics(JOIN *join, List<TABLE_LIST> &tables_list,
Perform range analysis if there are keys it could use (1).
Don't do range analysis if we're on the inner side of an outer join (2).
Do range analysis if we're on the inner side of a semi-join (3).
Don't do range analysis for materialized subqueries (4).
Don't do range analysis for materialized derived tables (5)
*/
if (!s->const_keys.is_clear_all() && // (1)
(!s->table->pos_in_table_list->embedding || // (2)
(s->table->pos_in_table_list->embedding && // (3)
s->table->pos_in_table_list->embedding->sj_on_expr)) && // (3)
!s->table->is_filled_at_execution())
if (!s->const_keys.is_clear_all() && // (1)
(!s->table->pos_in_table_list->embedding || // (2)
(s->table->pos_in_table_list->embedding && // (3)
s->table->pos_in_table_list->embedding->sj_on_expr)) && // (3)
!s->table->is_filled_at_execution() && // (4)
!(s->table->pos_in_table_list->derived && // (5)
s->table->pos_in_table_list->is_materialized_derived())) // (5)
{
ha_rows records;
SQL_SELECT *select;