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Fixed bug #5500: EXPLAIN returned a wrong select_type for queries using views.

Browse Source 
Select_type in the EXPLAIN output for the query SELECT * FROM t1 was
'SIMPLE', while for the query SELECT * FROM v1, where the view v1
was defined as SELECT * FROM t1, the EXPLAIN output contained 'PRIMARY'
for the select_type column.
This commit is contained in:
igor@rurik.mysql.com
2006-09-06 08:21:43 -07:00
parent ca3229dc1b
commit b7ded1e34f
8 changed files with 71 additions and 31 deletions
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4
mysql-test/r/group_by.result
View File

@ -807,8 +807,8 @@ explain
SELECT straight_join sql_no_cache v1.a, v1.b, v1.real_b from t2, v1 SELECT straight_join sql_no_cache v1.a, v1.b, v1.real_b from t2, v1
where t2.b=v1.a GROUP BY t2.b; where t2.b=v1.a GROUP BY t2.b;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 index b b 2 NULL 10 Using index 1 SIMPLE t2 index b b 2 NULL 10 Using index
1 PRIMARY t1 eq_ref PRIMARY PRIMARY 1 test.t2.b 1 1 SIMPLE t1 eq_ref PRIMARY PRIMARY 1 test.t2.b 1
SELECT straight_join sql_no_cache v1.a, v1.b, v1.real_b from t2, v1 SELECT straight_join sql_no_cache v1.a, v1.b, v1.real_b from t2, v1
where t2.b=v1.a GROUP BY t2.b; where t2.b=v1.a GROUP BY t2.b;
a b real_b a b real_b

2
mysql-test/r/information_schema.result
View File

@ -337,7 +337,7 @@ mysql
test test
explain select * from v0; explain select * from v0;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY # ALL NULL NULL NULL NULL 2 1 SIMPLE # ALL NULL NULL NULL NULL 2
create view v1 (c) as select table_name from information_schema.tables create view v1 (c) as select table_name from information_schema.tables
where table_name="v1"; where table_name="v1";
select * from v1; select * from v1;

2
mysql-test/r/olap.result
View File

@ -611,7 +611,7 @@ C
NULL NULL
EXPLAIN SELECT type FROM v1 GROUP BY type WITH ROLLUP; EXPLAIN SELECT type FROM v1 GROUP BY type WITH ROLLUP;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 10 Using filesort 1 SIMPLE t1 ALL NULL NULL NULL NULL 10 Using filesort
DROP VIEW v1; DROP VIEW v1;
DROP TABLE t1; DROP TABLE t1;
CREATE TABLE t1 (a int(11) NOT NULL); CREATE TABLE t1 (a int(11) NOT NULL);

8
mysql-test/r/range.result
View File

@ -750,13 +750,13 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 4 Using where; Using index 1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 4 Using where; Using index
EXPLAIN SELECT a,b FROM v1 WHERE a < 2 and b=3; EXPLAIN SELECT a,b FROM v1 WHERE a < 2 and b=3;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 range PRIMARY PRIMARY 4 NULL 4 Using where; Using index 1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 4 Using where; Using index
EXPLAIN SELECT a,b FROM t1 WHERE a < 2; EXPLAIN SELECT a,b FROM t1 WHERE a < 2;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 4 Using where; Using index 1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 4 Using where; Using index
EXPLAIN SELECT a,b FROM v1 WHERE a < 2; EXPLAIN SELECT a,b FROM v1 WHERE a < 2;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 range PRIMARY PRIMARY 4 NULL 4 Using where; Using index 1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 4 Using where; Using index
SELECT a,b FROM t1 WHERE a < 2 and b=3; SELECT a,b FROM t1 WHERE a < 2 and b=3;
a b a b
1 3 1 3
@ -799,13 +799,13 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range PRIMARY PRIMARY 8 NULL # Using where; Using index 1 SIMPLE t1 range PRIMARY PRIMARY 8 NULL # Using where; Using index
explain select * from v1 where a in (3,4) and b in (1,2,3); explain select * from v1 where a in (3,4) and b in (1,2,3);
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 range PRIMARY PRIMARY 8 NULL # Using where; Using index 1 SIMPLE t1 range PRIMARY PRIMARY 8 NULL # Using where; Using index
explain select * from t1 where a between 3 and 4 and b between 1 and 2; explain select * from t1 where a between 3 and 4 and b between 1 and 2;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range PRIMARY PRIMARY 8 NULL # Using where; Using index 1 SIMPLE t1 range PRIMARY PRIMARY 8 NULL # Using where; Using index
explain select * from v1 where a between 3 and 4 and b between 1 and 2; explain select * from v1 where a between 3 and 4 and b between 1 and 2;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 range PRIMARY PRIMARY 8 NULL # Using where; Using index 1 SIMPLE t1 range PRIMARY PRIMARY 8 NULL # Using where; Using index
drop view v1; drop view v1;
drop table t1; drop table t1;
create table t3 (a int); create table t3 (a int);

51
mysql-test/r/view.result
View File

@ -49,7 +49,7 @@ select v1.b from v1;
ERROR 42S22: Unknown column 'v1.b' in 'field list' ERROR 42S22: Unknown column 'v1.b' in 'field list'
explain extended select c from v1; explain extended select c from v1;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 5 1 SIMPLE t1 ALL NULL NULL NULL NULL 5
Warnings: Warnings:
Note 1003 select (`test`.`t1`.`b` + 1) AS `c` from `test`.`t1` Note 1003 select (`test`.`t1`.`b` + 1) AS `c` from `test`.`t1`
create algorithm=temptable view v2 (c) as select b+1 from t1; create algorithm=temptable view v2 (c) as select b+1 from t1;
@ -83,7 +83,7 @@ c
12 12
explain extended select c from v3; explain extended select c from v3;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 5 1 SIMPLE t1 ALL NULL NULL NULL NULL 5
Warnings: Warnings:
Note 1003 select ((`test`.`t1`.`b` + 1) + 1) AS `c` from `test`.`t1` Note 1003 select ((`test`.`t1`.`b` + 1) + 1) AS `c` from `test`.`t1`
create algorithm=temptable view v4 (c) as select c+1 from v2; create algorithm=temptable view v4 (c) as select c+1 from v2;
@ -376,7 +376,7 @@ c
30 30
explain extended select * from v1; explain extended select * from v1;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 5 Using where 1 SIMPLE t1 ALL NULL NULL NULL NULL 5 Using where
Warnings: Warnings:
Note 1003 select `test`.`t1`.`b` AS `c` from `test`.`t1` where (`test`.`t1`.`a` < 3) Note 1003 select `test`.`t1`.`b` AS `c` from `test`.`t1` where (`test`.`t1`.`a` < 3)
update v1 set c=c+1; update v1 set c=c+1;
@ -1391,9 +1391,9 @@ a a b
4 NULL NULL 4 NULL NULL
explain extended select * from t3 left join v3 on (t3.a = v3.a); explain extended select * from t3 left join v3 on (t3.a = v3.a);
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 1 SIMPLE t3 ALL NULL NULL NULL NULL 3
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 1 SIMPLE t1 ALL NULL NULL NULL NULL 3
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 1 SIMPLE t2 ALL NULL NULL NULL NULL 2
Warnings: Warnings:
Note 1003 select `test`.`t3`.`a` AS `a`,`test`.`t1`.`a` AS `a`,`test`.`t2`.`a` AS `b` from `test`.`t3` left join (`test`.`t1` left join `test`.`t2` on((`test`.`t1`.`a` = `test`.`t2`.`a`))) on((`test`.`t3`.`a` = `test`.`t1`.`a`)) where 1 Note 1003 select `test`.`t3`.`a` AS `a`,`test`.`t1`.`a` AS `a`,`test`.`t2`.`a` AS `b` from `test`.`t3` left join (`test`.`t1` left join `test`.`t2` on((`test`.`t1`.`a` = `test`.`t2`.`a`))) on((`test`.`t3`.`a` = `test`.`t1`.`a`)) where 1
create view v1 (a) as select a from t1; create view v1 (a) as select a from t1;
@ -1406,9 +1406,9 @@ a a b
4 NULL NULL 4 NULL NULL
explain extended select * from t3 left join v4 on (t3.a = v4.a); explain extended select * from t3 left join v4 on (t3.a = v4.a);
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 1 SIMPLE t3 ALL NULL NULL NULL NULL 3
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 1 SIMPLE t1 ALL NULL NULL NULL NULL 3
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 1 SIMPLE t2 ALL NULL NULL NULL NULL 2
Warnings: Warnings:
Note 1003 select `test`.`t3`.`a` AS `a`,`test`.`t1`.`a` AS `a`,`test`.`t2`.`a` AS `b` from `test`.`t3` left join (`test`.`t1` left join (`test`.`t2`) on((`test`.`t1`.`a` = `test`.`t2`.`a`))) on((`test`.`t3`.`a` = `test`.`t1`.`a`)) where 1 Note 1003 select `test`.`t3`.`a` AS `a`,`test`.`t1`.`a` AS `a`,`test`.`t2`.`a` AS `b` from `test`.`t3` left join (`test`.`t1` left join (`test`.`t2`) on((`test`.`t1`.`a` = `test`.`t2`.`a`))) on((`test`.`t3`.`a` = `test`.`t1`.`a`)) where 1
prepare stmt1 from "select * from t3 left join v4 on (t3.a = v4.a);"; prepare stmt1 from "select * from t3 left join v4 on (t3.a = v4.a);";
@ -2321,12 +2321,12 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ref a a 10 const,test.t1.b 2 Using where; Using index 1 SIMPLE t2 ref a a 10 const,test.t1.b 2 Using where; Using index
EXPLAIN SELECT * FROM v1 WHERE a=1; EXPLAIN SELECT * FROM v1 WHERE a=1;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ref a a 5 const 1 Using where; Using index 1 SIMPLE t1 ref a a 5 const 1 Using where; Using index
1 PRIMARY t2 ref a a 10 const,test.t1.b 2 Using where; Using index 1 SIMPLE t2 ref a a 10 const,test.t1.b 2 Using where; Using index
EXPLAIN SELECT * FROM v2 WHERE a=1; EXPLAIN SELECT * FROM v2 WHERE a=1;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ref a a 5 const 1 Using where; Using index 1 SIMPLE t1 ref a a 5 const 1 Using where; Using index
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 Using where 1 SIMPLE t3 ALL NULL NULL NULL NULL 3 Using where
DROP VIEW v1,v2; DROP VIEW v1,v2;
DROP TABLE t1,t2,t3; DROP TABLE t1,t2,t3;
create table t1 (f1 int); create table t1 (f1 int);
@ -2409,7 +2409,7 @@ insert into t1 values (1),(2);
create view v1 as select * from t1; create view v1 as select * from t1;
explain select id from v1 order by id; explain select id from v1 order by id;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 index NULL PRIMARY 4 NULL 2 Using index 1 SIMPLE t1 index NULL PRIMARY 4 NULL 2 Using index
drop view v1; drop view v1;
drop table t1; drop table t1;
create table t1(f1 int, f2 int); create table t1(f1 int, f2 int);
@ -2480,7 +2480,7 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
EXPLAIN SELECT MAX(a) FROM v1; EXPLAIN SELECT MAX(a) FROM v1;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Select tables optimized away 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
SELECT MIN(a) FROM t1; SELECT MIN(a) FROM t1;
MIN(a) MIN(a)
0 0
@ -2492,7 +2492,7 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
EXPLAIN SELECT MIN(a) FROM v1; EXPLAIN SELECT MIN(a) FROM v1;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Select tables optimized away 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
DROP VIEW v1; DROP VIEW v1;
DROP TABLE t1; DROP TABLE t1;
CREATE TABLE t1 (x varchar(10)); CREATE TABLE t1 (x varchar(10));
@ -2879,3 +2879,22 @@ View Create View
v1 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `t1`.`f1` AS `f1` from `t1` where (`t1`.`f1` between now() and (now() + interval 1 minute)) v1 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `t1`.`f1` AS `f1` from `t1` where (`t1`.`f1` between now() and (now() + interval 1 minute))
drop view v1; drop view v1;
drop table t1; drop table t1;
CREATE TABLE t1 (s1 int);
CREATE VIEW v1 AS SELECT * FROM t1;
EXPLAIN SELECT * FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 system NULL NULL NULL NULL 0 const row not found
EXPLAIN SELECT * FROM v1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 system NULL NULL NULL NULL 0 const row not found
INSERT INTO t1 VALUES (1), (3), (2);
EXPLAIN SELECT * FROM t1 t WHERE t.s1+1 < (SELECT MAX(t1.s1) FROM t1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t ALL NULL NULL NULL NULL 3 Using where
2 SUBQUERY t1 ALL NULL NULL NULL NULL 3
EXPLAIN SELECT * FROM v1 t WHERE t.s1+1 < (SELECT MAX(t1.s1) FROM t1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where
2 SUBQUERY t1 ALL NULL NULL NULL NULL 3
DROP VIEW v1;
DROP TABLE t1;

6
mysql-test/r/view_grant.result
View File

@ -103,7 +103,7 @@ ERROR 42000: SHOW VIEW command denied to user 'mysqltest_1'@'localhost' for tabl
grant select on mysqltest.t1 to mysqltest_1@localhost; grant select on mysqltest.t1 to mysqltest_1@localhost;
explain select c from mysqltest.v1; explain select c from mysqltest.v1;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 0 const row not found 1 SIMPLE t1 system NULL NULL NULL NULL 0 const row not found
show create view mysqltest.v1; show create view mysqltest.v1;
ERROR 42000: SHOW VIEW command denied to user 'mysqltest_1'@'localhost' for table 'v1' ERROR 42000: SHOW VIEW command denied to user 'mysqltest_1'@'localhost' for table 'v1'
explain select c from mysqltest.v2; explain select c from mysqltest.v2;
@ -123,7 +123,7 @@ ERROR 42000: SHOW VIEW command denied to user 'mysqltest_1'@'localhost' for tabl
grant show view on mysqltest.* to mysqltest_1@localhost; grant show view on mysqltest.* to mysqltest_1@localhost;
explain select c from mysqltest.v1; explain select c from mysqltest.v1;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 system NULL NULL NULL NULL 0 const row not found 1 SIMPLE t1 system NULL NULL NULL NULL 0 const row not found
show create view mysqltest.v1; show create view mysqltest.v1;
View Create View View Create View
v1 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `mysqltest`.`v1` AS select (`mysqltest`.`t1`.`a` + 1) AS `c`,(`mysqltest`.`t1`.`b` + 1) AS `d` from `mysqltest`.`t1` v1 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `mysqltest`.`v1` AS select (`mysqltest`.`t1`.`a` + 1) AS `c`,(`mysqltest`.`t1`.`b` + 1) AS `d` from `mysqltest`.`t1`
@ -136,7 +136,7 @@ View Create View
v2 CREATE ALGORITHM=TEMPTABLE DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `mysqltest`.`v2` AS select (`mysqltest`.`t1`.`a` + 1) AS `c`,(`mysqltest`.`t1`.`b` + 1) AS `d` from `mysqltest`.`t1` v2 CREATE ALGORITHM=TEMPTABLE DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `mysqltest`.`v2` AS select (`mysqltest`.`t1`.`a` + 1) AS `c`,(`mysqltest`.`t1`.`b` + 1) AS `d` from `mysqltest`.`t1`
explain select c from mysqltest.v3; explain select c from mysqltest.v3;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 system NULL NULL NULL NULL 0 const row not found 1 SIMPLE t2 system NULL NULL NULL NULL 0 const row not found
show create view mysqltest.v3; show create view mysqltest.v3;
View Create View View Create View
v3 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `mysqltest`.`v3` AS select (`mysqltest`.`t2`.`a` + 1) AS `c`,(`mysqltest`.`t2`.`b` + 1) AS `d` from `mysqltest`.`t2` v3 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `mysqltest`.`v3` AS select (`mysqltest`.`t2`.`a` + 1) AS `c`,(`mysqltest`.`t2`.`b` + 1) AS `d` from `mysqltest`.`t2`

18
mysql-test/t/view.test
View File

@ -2760,3 +2760,21 @@ create view v1 as select * from t1 where f1 between now() and now() + interval 1
show create view v1; show create view v1;
drop view v1; drop view v1;
drop table t1; drop table t1;
#
# Bug #5500: wrong select_type in EXPLAIN output for queries over views
#
CREATE TABLE t1 (s1 int);
CREATE VIEW v1 AS SELECT * FROM t1;
EXPLAIN SELECT * FROM t1;
EXPLAIN SELECT * FROM v1;
INSERT INTO t1 VALUES (1), (3), (2);
EXPLAIN SELECT * FROM t1 t WHERE t.s1+1 < (SELECT MAX(t1.s1) FROM t1);
EXPLAIN SELECT * FROM v1 t WHERE t.s1+1 < (SELECT MAX(t1.s1) FROM t1);
DROP VIEW v1;
DROP TABLE t1;

11
sql/sql_select.cc
View File

@ -14221,9 +14221,12 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
item_list.push_back(new Item_string(table_name_buffer, len, cs)); item_list.push_back(new Item_string(table_name_buffer, len, cs));
} }
else else
item_list.push_back(new Item_string(table->alias, {
strlen(table->alias), TABLE_LIST *tab=table->pos_in_table_list;
item_list.push_back(new Item_string(tab->alias,
strlen(tab->alias),
cs)); cs));
}
/* type */ /* type */
item_list.push_back(new Item_string(join_type_str[tab->type], item_list.push_back(new Item_string(join_type_str[tab->type],
strlen(join_type_str[tab->type]), strlen(join_type_str[tab->type]),
@ -14410,8 +14413,8 @@ bool mysql_explain_union(THD *thd, SELECT_LEX_UNIT *unit, select_result *result)
// drop UNCACHEABLE_EXPLAIN, because it is for internal usage only // drop UNCACHEABLE_EXPLAIN, because it is for internal usage only
uint8 uncacheable= (sl->uncacheable & ~UNCACHEABLE_EXPLAIN); uint8 uncacheable= (sl->uncacheable & ~UNCACHEABLE_EXPLAIN);
sl->type= (((&thd->lex->select_lex)==sl)? sl->type= (((&thd->lex->select_lex)==sl)?
((thd->lex->all_selects_list != sl) ? (sl->first_inner_unit() || sl->next_select() ?
primary_key_name : "SIMPLE"): "PRIMARY" : "SIMPLE"):
((sl == first)? ((sl == first)?
((sl->linkage == DERIVED_TABLE_TYPE) ? ((sl->linkage == DERIVED_TABLE_TYPE) ?
"DERIVED": "DERIVED":