Fixed LP bug #953649.

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.

mysql-test/r/derived_view.result

@@ -1960,6 +1960,42 @@ ON ( COLUMNS.TABLE_SCHEMA = UNIQUES.TABLE_SCHEMA);
 COUNT(*) > 0
 1
 DROP TABLE t1;
-set SESSION optimizer_switch= @save_optimizer_switch;
+SET SESSION optimizer_switch= @save_optimizer_switch;
+#
+# LP BUG#953649: crash when estimating the cost of a look-up  
+#                into a derived table to be materialized 
+#
+CREATE TABLE t1 (a int);
+INSERT INTO t1 VALUES (132);
+CREATE TABLE t2 (b int, c varchar(256));
+INSERT INTO t2 VALUES (132,'test1'), (120,'text2'), (132,'text3');
+CREATE VIEW v AS
+SELECT b, GROUP_CONCAT(c) AS gc FROM t2 GROUP BY b;
+SET @save_optimizer_switch=@@optimizer_switch;
+SET SESSION optimizer_switch='derived_merge=off';
+SET SESSION optimizer_switch='derived_with_keys=off';
+EXPLAIN
+SELECT * FROM t1, v WHERE a = b;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	1	
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	3	Using where
+2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	3	Using filesort
+SELECT * FROM t1, v WHERE a = b;
+a	b	gc
+132	132	test1,text3
+SET SESSION optimizer_switch='derived_merge=on';
+SET SESSION optimizer_switch='derived_with_keys=on';
+EXPLAIN
+SELECT * FROM t1, v WHERE a = b;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	1	
+1	PRIMARY	<derived2>	ref	key0	key0	5	const	0	
+2	DERIVED	t2	ALL	NULL	NULL	NULL	NULL	3	Using filesort
+SELECT * FROM t1, v WHERE a = b;
+a	b	gc
+132	132	test1,text3
+SET SESSION optimizer_switch= @save_optimizer_switch;
+DROP VIEW v;
+DROP TABLE t1,t2;
 set optimizer_switch=@exit_optimizer_switch;
 set join_cache_level=@exit_join_cache_level;

mysql-test/t/derived_view.test

@@ -1345,7 +1345,40 @@ SELECT COUNT(*) > 0
 
 DROP TABLE t1;
 
-set SESSION optimizer_switch= @save_optimizer_switch;
+SET SESSION optimizer_switch= @save_optimizer_switch;
+
+--echo #
+--echo # LP BUG#953649: crash when estimating the cost of a look-up  
+--echo #                into a derived table to be materialized 
+--echo #
+
+CREATE TABLE t1 (a int);
+INSERT INTO t1 VALUES (132);
+
+CREATE TABLE t2 (b int, c varchar(256));
+INSERT INTO t2 VALUES (132,'test1'), (120,'text2'), (132,'text3');
+
+CREATE VIEW v AS
+  SELECT b, GROUP_CONCAT(c) AS gc FROM t2 GROUP BY b;
+
+SET @save_optimizer_switch=@@optimizer_switch;
+
+SET SESSION optimizer_switch='derived_merge=off'; 
+SET SESSION optimizer_switch='derived_with_keys=off'; 
+EXPLAIN
+SELECT * FROM t1, v WHERE a = b;
+SELECT * FROM t1, v WHERE a = b;
+
+SET SESSION optimizer_switch='derived_merge=on'; 
+SET SESSION optimizer_switch='derived_with_keys=on'; 
+EXPLAIN
+SELECT * FROM t1, v WHERE a = b;
+SELECT * FROM t1, v WHERE a = b;
+
+SET SESSION optimizer_switch= @save_optimizer_switch;
+
+DROP VIEW v;
+DROP TABLE t1,t2;
 
 # The following command must be the last one the file 
 set optimizer_switch=@exit_optimizer_switch;

sql/sql_derived.cc

@@ -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,

sql/sql_select.cc

@@ -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;