Merge sanja.is.com.ua:/home/bell/mysql/bk/mysql-4.1 (a94c7639) · Commits · Software / OSDI20 Artifacts / mariadb

mysql-test/r/subselect.result

+9 −6

Original line number	Diff line number	Diff line
		@@ -55,7 +55,7 @@ SELECT 1 FROM (SELECT 1 as a) as b HAVING (SELECT a)=1;
		1
		1
		SELECT (SELECT 1), a;
		ERROR 42S22: Unknown column 'a' in 'checking transformed subquery'
		ERROR 42S22: Unknown column 'a' in 'field list'
		SELECT 1 as a FROM (SELECT 1) as b HAVING (SELECT a)=1;
		a
		1
		@@ -999,7 +999,9 @@ drop table t1, t2;
		CREATE TABLE `t1` (`i` int(11) NOT NULL default '0',PRIMARY KEY (`i`)) ENGINE=MyISAM CHARSET=latin1;
		INSERT INTO t1 VALUES (1);
		UPDATE t1 SET i=i+1 WHERE i=(SELECT MAX(i));
		ERROR HY000: Invalid use of group function
		select * from t1;
		i
		1
		drop table t1;
		CREATE TABLE t1 (a int(1));
		EXPLAIN EXTENDED SELECT (SELECT RAND() FROM t1) FROM t1;
		@@ -1084,7 +1086,7 @@ SHOW CREATE TABLE t1;
		Table Create Table
		t1 CREATE TABLE `t1` (
		`a` bigint(20) NOT NULL default '0',
		`(SELECT a)` bigint(20) default NULL
		`(SELECT a)` bigint(20) NOT NULL default '0'
		) ENGINE=MyISAM DEFAULT CHARSET=latin1
		drop table t1;
		CREATE TABLE t1 SELECT * FROM (SELECT 1 as a,(SELECT a+0)) a;
		@@ -1102,7 +1104,7 @@ a
		SHOW CREATE TABLE t1;
		Table Create Table
		t1 CREATE TABLE `t1` (
		`a` bigint(20) default NULL
		`a` bigint(20) NOT NULL default '0'
		) ENGINE=MyISAM DEFAULT CHARSET=latin1
		drop table t1;
		create table t1 (a int);
		@@ -1186,11 +1188,12 @@ PRIMARY KEY (`i`)
		) ENGINE=MyISAM CHARSET=latin1;
		INSERT INTO t1 VALUES (1);
		UPDATE t1 SET i=i+(SELECT MAX(i) FROM (SELECT 1) t) WHERE i=(SELECT MAX(i));
		ERROR HY000: Invalid use of group function
		UPDATE t1 SET i=i+1 WHERE i=(SELECT MAX(i));
		ERROR HY000: Invalid use of group function
		UPDATE t1 SET t.i=i+(SELECT MAX(i) FROM (SELECT 1) t);
		ERROR 42S02: Unknown table 't' in field list
		select * from t1;
		i
		1
		drop table t1;
		CREATE TABLE t1 (
		id int(11) default NULL

mysql-test/t/subselect.test

+2 −3

Original line number	Diff line number	Diff line
		@@ -543,8 +543,8 @@ drop table t1, t2;

		CREATE TABLE `t1` (`i` int(11) NOT NULL default '0',PRIMARY KEY (`i`)) ENGINE=MyISAM CHARSET=latin1;
		INSERT INTO t1 VALUES (1);
		-- error 1111
		UPDATE t1 SET i=i+1 WHERE i=(SELECT MAX(i));
		select * from t1;
		drop table t1;

		#test of uncacheable subqueries
		@@ -689,12 +689,11 @@ CREATE TABLE `t1` (
		) ENGINE=MyISAM CHARSET=latin1;

		INSERT INTO t1 VALUES (1);
		-- error 1111
		UPDATE t1 SET i=i+(SELECT MAX(i) FROM (SELECT 1) t) WHERE i=(SELECT MAX(i));
		-- error 1111
		UPDATE t1 SET i=i+1 WHERE i=(SELECT MAX(i));
		-- error 1109
		UPDATE t1 SET t.i=i+(SELECT MAX(i) FROM (SELECT 1) t);
		select * from t1;
		drop table t1;

		#

sql/item_subselect.cc

+76 −15

Original line number	Diff line number	Diff line
		@@ -164,12 +164,7 @@ bool Item_subselect::fix_fields(THD thd_param, TABLE_LIST tables, Item **ref)
		thd->where= "checking transformed subquery";
		if (!(*ref)->fixed)
		ret= (*ref)->fix_fields(thd, tables, ref);
		// We can't substitute aggregate functions like "SELECT (max(i))"
		if (substype() == SINGLEROW_SUBS && (*ref)->with_sum_func)
		{
		my_error(ER_INVALID_GROUP_FUNC_USE, MYF(0));
		return 1;
		}
		thd->where= save_where;
		return ret;
		}
		// Is it one field subselect?
		@@ -322,6 +317,7 @@ Item_singlerow_subselect::select_transformer(JOIN *join)
		if (!select_lex->master_unit()->first_select()->next_select() &&
		!select_lex->table_list.elements &&
		select_lex->item_list.elements == 1 &&
		!select_lex->item_list.head()->with_sum_func &&
		/*
		We cant change name of Item_field or Item_ref, because it will
		prevent it's correct resolving, but we should save name of
		@@ -330,7 +326,13 @@ Item_singlerow_subselect::select_transformer(JOIN *join)
		TODO: solve above problem
		*/
		!(select_lex->item_list.head()->type() == FIELD_ITEM \|\|
		select_lex->item_list.head()->type() == REF_ITEM)
		select_lex->item_list.head()->type() == REF_ITEM) &&
		/*
		switch off this optimisation for prepare statement,
		because we do not rollback this changes
		TODO: make rollback for it, or special name resolving mode in 5.0.
		*/
		!arena->is_stmt_prepare()
		)
		{

		@@ -352,9 +354,6 @@ Item_singlerow_subselect::select_transformer(JOIN *join)
		if (join->conds \|\| join->having)
		{
		Item *cond;
		if (arena->is_stmt_prepare())
		thd->set_n_backup_item_arena(arena, &backup);

		if (!join->having)
		cond= join->conds;
		else if (!join->conds)
		@@ -365,16 +364,12 @@ Item_singlerow_subselect::select_transformer(JOIN *join)
		if (!(substitution= new Item_func_if(cond, substitution,
		new Item_null())))
		goto err;
		if (arena->is_stmt_prepare())
		thd->restore_backup_item_arena(arena, &backup);
		}
		return RES_REDUCE;
		}
		return RES_OK;

		err:
		if (arena->is_stmt_prepare())
		thd->restore_backup_item_arena(arena, &backup);
		return RES_ERROR;
		}

		@@ -401,6 +396,13 @@ void Item_singlerow_subselect::fix_length_and_dec()
		engine->fix_length_and_dec(row);
		value= *row;
		}
		/*
		If there are not tables in subquery then ability to have NULL value
		depends on SELECT list (if single row subquery have tables then it
		always can be NULL if there are not records fetched).
		*/
		if (engine->no_tables())
		maybe_null= engine->may_be_null();
		}

		uint Item_singlerow_subselect::cols()
		@@ -644,6 +646,7 @@ Item_subselect::trans_res
		Item_in_subselect::single_value_transformer(JOIN *join,
		Comp_creator *func)
		{
		const char *save_where= thd->where;
		DBUG_ENTER("Item_in_subselect::single_value_transformer");

		if (changed)
		@@ -899,6 +902,7 @@ Item_in_subselect::single_value_transformer(JOIN *join,
		ok:
		if (arena->is_stmt_prepare())
		thd->restore_backup_item_arena(arena, &backup);
		thd->where= save_where;
		DBUG_RETURN(RES_OK);

		err:
		@@ -911,6 +915,7 @@ Item_in_subselect::single_value_transformer(JOIN *join,
		Item_subselect::trans_res
		Item_in_subselect::row_value_transformer(JOIN *join)
		{
		const char *save_where= thd->where;
		DBUG_ENTER("Item_in_subselect::row_value_transformer");

		if (changed)
		@@ -1003,6 +1008,7 @@ Item_in_subselect::row_value_transformer(JOIN *join)
		}
		if (arena->is_stmt_prepare())
		thd->restore_backup_item_arena(arena, &backup);
		thd->where= save_where;
		DBUG_RETURN(RES_OK);

		err:
		@@ -1562,3 +1568,58 @@ int subselect_uniquesubquery_engine::change_item(Item_subselect *si,
		DBUG_ASSERT(0);
		return -1;
		}


		/*
		Report about presence of tables in subquery

		SINOPSYS
		subselect_single_select_engine::no_tables()

		RETURN
		TRUE there are not tables used in subquery
		FALSE there are some tables in subquery
		*/
		bool subselect_single_select_engine::no_tables()
		{
		return(select_lex->table_list.elements == 0);
		}


		/*
		Report about presence of tables in subquery

		SINOPSYS
		subselect_union_engine::no_tables()

		RETURN
		TRUE there are not tables used in subquery
		FALSE there are some tables in subquery
		*/
		bool subselect_union_engine::no_tables()
		{
		for (SELECT_LEX *sl= unit->first_select(); sl; sl= sl->next_select())
		{
		if (sl->table_list.elements)
		return FALSE;
		}
		return TRUE;
		}


		/*
		Report about presence of tables in subquery

		SINOPSYS
		subselect_uniquesubquery_engine::no_tables()

		RETURN
		TRUE there are not tables used in subquery
		FALSE there are some tables in subquery
		*/

		bool subselect_uniquesubquery_engine::no_tables()
		{
		/* returning value is correct, but this method should never be called */
		return 0;
		}

sql/item_subselect.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -291,6 +291,7 @@ class subselect_engine: public Sql_alloc
		static table_map calc_const_tables(TABLE_LIST *);
		virtual void print(String *str)= 0;
		virtual int change_item(Item_subselect si, select_subselect result)= 0;
		virtual bool no_tables()= 0;
		};


		@@ -315,6 +316,7 @@ class subselect_single_select_engine: public subselect_engine
		table_map upper_select_const_tables();
		void print (String *str);
		int change_item(Item_subselect si, select_subselect result);
		bool no_tables();
		};


		@@ -335,6 +337,7 @@ class subselect_union_engine: public subselect_engine
		table_map upper_select_const_tables();
		void print (String *str);
		int change_item(Item_subselect si, select_subselect result);
		bool no_tables();
		};


		@@ -364,6 +367,7 @@ class subselect_uniquesubquery_engine: public subselect_engine
		table_map upper_select_const_tables() { return 0; }
		void print (String *str);
		int change_item(Item_subselect si, select_subselect result);
		bool no_tables();
		};