Bug#12770 DESC cannot display the info. about temporary table

Bug#14387 SHOW COLUMNS doesn't work on temporary tables.
Bug#15224 SHOW INDEX from temporary table doesn't work.
  Restore thd->temporary_tables to be able to process
  temporary tables(only for 'show index' & 'show columns').
  This should be changed when processing of temporary tables for
  I_S tables will be done.

mysql-test/r/information_schema.result

@@ -1056,3 +1056,14 @@ where table_name="v1";
 table_type
 VIEW
 drop view v1;
+create temporary table t1(f1 int, index(f1));
+show columns from t1;
+Field	Type	Null	Key	Default	Extra
+f1	int(11)	YES	MUL	NULL	
+describe t1;
+Field	Type	Null	Key	Default	Extra
+f1	int(11)	YES	MUL	NULL	
+show indexes from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
+t1	1	f1	1	f1	A	NULL	NULL	NULL	YES	BTREE	
+drop table t1;

mysql-test/t/information_schema.test

@@ -748,3 +748,14 @@ drop table t1;
 select table_type from information_schema.tables
 where table_name="v1";
 drop view v1;
+
+#
+# Bug #14387 SHOW COLUMNS doesn't work on temporary tables
+# Bug #15224 SHOW INDEX from temporary table doesn't work
+# Bug #12770 DESC cannot display the info. about temporary table
+#
+create temporary table t1(f1 int, index(f1));
+show columns from t1;
+describe t1;
+show indexes from t1;
+drop table t1;

sql/sql_show.cc

@@ -2069,6 +2069,13 @@ int get_all_tables(THD *thd, TABLE_LIST *tables, COND *cond)
     bool res;
 
     lex->all_selects_list= lsel;
+    /*
+      Restore thd->temporary_tables to be able to process
+      temporary tables(only for 'show index' & 'show columns').
+      This should be changed when processing of temporary tables for
+      I_S tables will be done.
+    */
+    thd->temporary_tables= open_tables_state_backup.temporary_tables;
     res= open_normal_and_derived_tables(thd, show_table_list,
                                         MYSQL_LOCK_IGNORE_FLUSH);
     /*
@@ -2088,6 +2095,7 @@ int get_all_tables(THD *thd, TABLE_LIST *tables, COND *cond)
                                              show_table_list->view_db.str :
                                              show_table_list->db),
                                             show_table_list->alias));
+    thd->temporary_tables= 0;
     close_thread_tables(thd);
     show_table_list->table= 0;
     goto err;