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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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1
sql/sql_derived.cc
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@ -811,6 +811,7 @@ bool mysql_derived_create(THD *thd, LEX *lex, TABLE_LIST *derived)
select_union *result= (select_union*)unit->result;
if (table->s->db_type() == TMP_ENGINE_HTON)
{
result->tmp_table_param.keyinfo= table->s->key_info;
if (create_internal_tmp_table(table, result->tmp_table_param.keyinfo,
result->tmp_table_param.start_recinfo,
&result->tmp_table_param.recinfo,