Merge moonbone.local:/mnt/gentoo64/work/22331-bug-5.0-opt-mysql

into  moonbone.local:/mnt/gentoo64/work/25373-bug-5.0-opt-mysql

mysql-test/r/explain.result

@@ -57,3 +57,32 @@ select 3 into @v1;
 explain select 3 into @v1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+create table t1(f1 int, f2 int);
+insert into t1 values (1,1);
+create view v1 as select * from t1 where f1=1;
+explain extended select * from v1 where f2=1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	1	
+Warnings:
+Note	1003	select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f2` AS `f2` from `test`.`t1` where 1
+explain extended select * from t1 where 0;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
+Warnings:
+Note	1003	select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f2` AS `f2` from `test`.`t1` where 0
+explain extended select * from t1 where 1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	1	
+Warnings:
+Note	1003	select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f2` AS `f2` from `test`.`t1` where 1
+explain extended select * from t1 having 0;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible HAVING
+Warnings:
+Note	1003	select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f2` AS `f2` from `test`.`t1` having 0
+explain extended select * from t1 having 1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	1	
+Warnings:
+Note	1003	select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f2` AS `f2` from `test`.`t1` having 1
+drop table t1;

mysql-test/r/func_test.result

@@ -79,7 +79,7 @@ explain extended select * from t1 where 1 xor 1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
 Warnings:
-Note	1003	select `test`.`t1`.`a` AS `a` from `test`.`t1`
+Note	1003	select `test`.`t1`.`a` AS `a` from `test`.`t1` where 0
 select - a from t1;
 - a
 -1

mysql-test/r/subselect.result

@@ -421,7 +421,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 3	UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	
 Warnings:
-Note	1003	select 1 AS `1` from `test`.`t1`
+Note	1003	select 1 AS `1` from `test`.`t1` where 1
 drop table t1;
 CREATE TABLE `t1` (
 `numeropost` mediumint(8) unsigned NOT NULL auto_increment,
@@ -1180,7 +1180,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 2	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
 Warnings:
-Note	1003	select <in_optimizer>(0,<exists>(select 1 AS `Not_used` from `test`.`t1` `a`)) AS `0 IN (SELECT 1 FROM t1 a)`
+Note	1003	select <in_optimizer>(0,<exists>(select 1 AS `Not_used` from `test`.`t1` `a` where 0)) AS `0 IN (SELECT 1 FROM t1 a)`
 INSERT INTO t1 (pseudo) VALUES ('test1');
 SELECT 0 IN (SELECT 1 FROM t1 a);
 0 IN (SELECT 1 FROM t1 a)
@@ -1190,7 +1190,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 2	DEPENDENT SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
 Warnings:
-Note	1003	select <in_optimizer>(0,<exists>(select 1 AS `Not_used` from `test`.`t1` `a`)) AS `0 IN (SELECT 1 FROM t1 a)`
+Note	1003	select <in_optimizer>(0,<exists>(select 1 AS `Not_used` from `test`.`t1` `a` where 0)) AS `0 IN (SELECT 1 FROM t1 a)`
 drop table t1;
 CREATE TABLE `t1` (
 `i` int(11) NOT NULL default '0',
@@ -1532,7 +1532,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
 2	SUBQUERY	t2	system	NULL	NULL	NULL	NULL	0	const row not found
 Warnings:
-Note	1003	select `test`.`t3`.`a` AS `a` from `test`.`t3`
+Note	1003	select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
 select * from t3 where NULL >= any (select b from t2 group by 1);
 a
 explain extended select * from t3 where NULL >= any (select b from t2 group by 1);
@@ -1540,7 +1540,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
 2	SUBQUERY	t2	system	NULL	NULL	NULL	NULL	0	const row not found
 Warnings:
-Note	1003	select `test`.`t3`.`a` AS `a` from `test`.`t3`
+Note	1003	select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
 select * from t3 where NULL >= some (select b from t2);
 a
 explain extended select * from t3 where NULL >= some (select b from t2);
@@ -1548,7 +1548,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
 2	SUBQUERY	t2	system	NULL	NULL	NULL	NULL	0	const row not found
 Warnings:
-Note	1003	select `test`.`t3`.`a` AS `a` from `test`.`t3`
+Note	1003	select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
 select * from t3 where NULL >= some (select b from t2 group by 1);
 a
 explain extended select * from t3 where NULL >= some (select b from t2 group by 1);
@@ -1556,7 +1556,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
 2	SUBQUERY	t2	system	NULL	NULL	NULL	NULL	0	const row not found
 Warnings:
-Note	1003	select `test`.`t3`.`a` AS `a` from `test`.`t3`
+Note	1003	select `test`.`t3`.`a` AS `a` from `test`.`t3` where 0
 insert into t2 values (2,2), (2,1), (3,3), (3,1);
 select * from t3 where a > all (select max(b) from t2 group by a);
 a
@@ -1618,7 +1618,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 3	UNION	t1	system	NULL	NULL	NULL	NULL	1	
 NULL	UNION RESULT	<union2,3>	ALL	NULL	NULL	NULL	NULL	NULL	
 Warnings:
-Note	1003	select `test`.`t1`.`s1` AS `s1` from `test`.`t1`
+Note	1003	select `test`.`t1`.`s1` AS `s1` from `test`.`t1` where 1
 drop table t1;
 CREATE TABLE t1 (number char(11) NOT NULL default '') ENGINE=MyISAM CHARSET=latin1;
 INSERT INTO t1 VALUES ('69294728265'),('18621828126'),('89356874041'),('95895001874');

mysql-test/t/explain.test

@@ -51,4 +51,18 @@ set names latin1;
 select 3 into @v1;
 explain select 3 into @v1;
 
+#
+# Bug#22331: Wrong WHERE in EXPLAIN EXTENDED when all expressions were
+#            optimized away.
+#
+create table t1(f1 int, f2 int);
+insert into t1 values (1,1);
+create view v1 as select * from t1 where f1=1;
+explain extended select * from v1 where f2=1;
+explain extended select * from t1 where 0;
+explain extended select * from t1 where 1;
+explain extended select * from t1 having 0;
+explain extended select * from t1 having 1;
+drop table t1;
+
 # End of 5.0 tests.

sql/sql_lex.cc

@@ -1195,6 +1195,7 @@ void st_select_lex::init_select()
   is_correlated= 0;
   cur_pos_in_select_list= UNDEF_POS;
   non_agg_fields.empty();
+  cond_value= having_value= Item::COND_UNDEF;
   inner_refs_list.empty();
 }
 

sql/sql_lex.h

@@ -488,6 +488,8 @@ class st_select_lex: public st_select_lex_node
   Item *where, *having;                         /* WHERE & HAVING clauses */
   Item *prep_where; /* saved WHERE clause for prepared statement processing */
   Item *prep_having;/* saved HAVING clause for prepared statement processing */
+  /* Saved values of the WHERE and HAVING clauses*/
+  Item::cond_result cond_value, having_value;
   /* point on lex in which it was created, used in view subquery detection */
   st_lex *parent_lex;
   enum olap_type olap;

sql/sql_select.cc

@@ -749,7 +749,6 @@ JOIN::optimize()
   }
 
   {
-    Item::cond_result having_value;
     having= optimize_cond(this, having, join_list, &having_value);
     if (thd->net.report_error)
     {
@@ -757,6 +756,10 @@ JOIN::optimize()
       DBUG_PRINT("error",("Error from optimize_cond"));
       DBUG_RETURN(1);
     }
+    if (select_lex->where)
+      select_lex->cond_value= cond_value;
+    if (select_lex->having)
+      select_lex->having_value= having_value;
 
     if (cond_value == Item::COND_FALSE || having_value == Item::COND_FALSE || 
         (!unit->select_limit_cnt && !(select_options & OPTION_FOUND_ROWS)))
@@ -897,6 +900,7 @@ JOIN::optimize()
     conds->update_used_tables();
     DBUG_EXECUTE("where", print_where(conds, "after substitute_best_equal"););
   }
+
   /*
     Permorm the the optimization on fields evaluation mentioned above
     for all on expressions.
@@ -7606,6 +7610,9 @@ static COND* substitute_for_best_equal_field(COND *cond,
           break;
       }
     }
+    if (!((Item_cond*)cond)->argument_list()->elements)
+      cond= new Item_int(cond->val_bool());
+
   }
   else if (cond->type() == Item::FUNC_ITEM && 
            ((Item_cond*) cond)->functype() == Item_func::MULT_EQUAL_FUNC)
@@ -15324,10 +15331,13 @@ void st_select_lex::print(THD *thd, String *str)
   Item *cur_where= where;
   if (join)
     cur_where= join->conds;
-  if (cur_where)
+  if (cur_where || cond_value != Item::COND_UNDEF)
   {
     str->append(STRING_WITH_LEN(" where "));
-    cur_where->print(str);
+    if (cur_where)
+      cur_where->print(str);
+    else
+      str->append(cond_value != Item::COND_FALSE ? "1" : "0");
   }
 
   // group by & olap
@@ -15353,10 +15363,13 @@ void st_select_lex::print(THD *thd, String *str)
   if (join)
     cur_having= join->having;
 
-  if (cur_having)
+  if (cur_having || having_value != Item::COND_UNDEF)
   {
     str->append(STRING_WITH_LEN(" having "));
-    cur_having->print(str);
+    if (cur_having)
+      cur_having->print(str);
+    else
+      str->append(having_value != Item::COND_FALSE ? "1" : "0");
   }
 
   if (order_list.elements)

sql/sql_select.h

@@ -292,7 +292,7 @@ class JOIN :public Sql_alloc
 
   bool need_tmp, hidden_group_fields;
   DYNAMIC_ARRAY keyuse;
-  Item::cond_result cond_value;
+  Item::cond_result cond_value, having_value;
   List<Item> all_fields; // to store all fields that used in query
   //Above list changed to use temporary table
   List<Item> tmp_all_fields1, tmp_all_fields2, tmp_all_fields3;