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MDEV-11953: support of brackets in UNION/EXCEPT/INTERSECT operations
2018-05-22 19:08:39 +02:00
select 1 union ( select 2 union select 3);
1
1
2
3
explain extended
select 1 union ( select 2 union select 3);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
4 UNION <derived2> ALL NULL NULL NULL NULL 2 100.00
2 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL No tables used
3 UNION NULL NULL NULL NULL NULL NULL NULL NULL No tables used
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL
NULL UNION RESULT <union1,4> ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 /* select#1 */ select 1 AS `1` union /* select#4 */ select `__4`.`2` AS `2` from (/* select#2 */ select 2 AS `2` union /* select#3 */ select 3 AS `3`) `__4`
select 1 union ( select 1 union select 1);
1
1
explain extended
select 1 union ( select 1 union select 1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
4 UNION <derived2> ALL NULL NULL NULL NULL 2 100.00
2 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL No tables used
3 UNION NULL NULL NULL NULL NULL NULL NULL NULL No tables used
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL
NULL UNION RESULT <union1,4> ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 /* select#1 */ select 1 AS `1` union /* select#4 */ select `__4`.`1` AS `1` from (/* select#2 */ select 1 AS `1` union /* select#3 */ select 1 AS `1`) `__4`
select 1 union all ( select 1 union select 1);
1
1
1
explain extended
select 1 union all ( select 1 union select 1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
4 UNION <derived2> ALL NULL NULL NULL NULL 2 100.00
2 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL No tables used
3 UNION NULL NULL NULL NULL NULL NULL NULL NULL No tables used
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 /* select#1 */ select 1 AS `1` union all /* select#4 */ select `__4`.`1` AS `1` from (/* select#2 */ select 1 AS `1` union /* select#3 */ select 1 AS `1`) `__4`
select 1 union ( select 1 union all select 1);
1
1
explain extended
select 1 union ( select 1 union all select 1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
4 UNION <derived2> ALL NULL NULL NULL NULL 2 100.00
2 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL No tables used
3 UNION NULL NULL NULL NULL NULL NULL NULL NULL No tables used
NULL UNION RESULT <union1,4> ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 /* select#1 */ select 1 AS `1` union /* select#4 */ select `__4`.`1` AS `1` from (/* select#2 */ select 1 AS `1` union all /* select#3 */ select 1 AS `1`) `__4`
select 1 union select 1 union all select 1;
1
1
1
explain extended
select 1 union select 1 union all select 1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
2 UNION NULL NULL NULL NULL NULL NULL NULL NULL No tables used
3 UNION NULL NULL NULL NULL NULL NULL NULL NULL No tables used
NULL UNION RESULT <union1,2,3> ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 /* select#1 */ select 1 AS `1` union /* select#2 */ select 1 AS `1` union all /* select#3 */ select 1 AS `1`
(select 1 as a) union (select 2) order by a;
a
1
2
explain extended
(select 1 as a) union (select 2) order by a;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
2 UNION NULL NULL NULL NULL NULL NULL NULL NULL No tables used
NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL NULL Using filesort
Warnings:
Note 1003 (/* select#1 */ select 1 AS `a`) union (/* select#2 */ select 2 AS `2`) order by `a`
/* select#1 */ select 1 AS `a` union /* select#2 */ select 2 AS `2` order by `a`;
a
1
2
explain extended
/* select#1 */ select 1 AS `a` union /* select#2 */ select 2 AS `2` order by `a`;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
2 UNION NULL NULL NULL NULL NULL NULL NULL NULL No tables used
NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL NULL Using filesort
Warnings:
Note 1003 /* select#1 */ select 1 AS `a` union /* select#2 */ select 2 AS `2` order by `a`
select 1 union ( select 1 union (select 1 union (select 1 union select 1)));
1
1
explain extended all
select 1 union ( select 1 union (select 1 union (select 1 union select 1)));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL No tables used
8 UNION <derived2> ALL NULL NULL NULL NULL 2 100.00
2 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL No tables used
7 UNION <derived3> ALL NULL NULL NULL NULL 2 100.00
3 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL No tables used
6 UNION <derived4> ALL NULL NULL NULL NULL 2 100.00
4 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL No tables used
5 UNION NULL NULL NULL NULL NULL NULL NULL NULL No tables used
NULL UNION RESULT <union4,5> ALL NULL NULL NULL NULL NULL NULL
NULL UNION RESULT <union3,6> ALL NULL NULL NULL NULL NULL NULL
NULL UNION RESULT <union2,7> ALL NULL NULL NULL NULL NULL NULL
NULL UNION RESULT <union1,8> ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 /* select#1/0 Filter Select: select `1` AS `1` */ select 1 AS `1` union /* select#8/0 */ select `__8`.`1` AS `1` from (/* select#2/1 Filter Select: select `1` AS `1` */ select 1 AS `1` union /* select#7/1 */ select `__7`.`1` AS `1` from (/* select#3/2 Filter Select: select `1` AS `1` */ select 1 AS `1` union /* select#6/2 */ select `__6`.`1` AS `1` from (/* select#4/3 Filter Select: select `1` AS `1` */ select 1 AS `1` union /* select#5/3 */ select 1 AS `1`) `__6`) `__7`) `__8`
#
# MDEV-6341: INSERT ... SELECT UNION with parenthesis
#
create table t1 (a int, b int);
insert into t1 (select 1,1 union select 2,2);
select * from t1 order by 1;
a b
1 1
2 2
delete from t1;
insert into t1 select 1,1 union select 2,2;
select * from t1 order by 1;
a b
1 1
2 2
drop table t1;
CREATE OR REPLACE TABLE t1 AS SELECT 1 AS a UNION SELECT 2;
select * from t1 order by 1;
a
1
2
drop table t1;
CREATE OR REPLACE TABLE t1 AS (SELECT 1 AS a UNION SELECT 2);
select * from t1 order by 1;
a
1
2
drop table t1;
CREATE OR REPLACE VIEW v1 AS (SELECT 1 AS a);
show create view v1;
View Create View character_set_client collation_connection
v1 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS (select 1 AS `a`) latin1 latin1_swedish_ci
drop view v1;
CREATE OR REPLACE VIEW v1 AS SELECT 1 AS a UNION SELECT 2;
show create view v1;
View Create View character_set_client collation_connection
v1 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select 1 AS `a` union select 2 AS `2` latin1 latin1_swedish_ci
drop view v1;
CREATE OR REPLACE VIEW v1 AS (SELECT 1 AS a UNION SELECT 2);
show create view v1;
View Create View character_set_client collation_connection
v1 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select 1 AS `a` union select 2 AS `2` latin1 latin1_swedish_ci
drop view v1;
#
# MDEV-10028: Syntax error on ((SELECT ...) UNION (SELECT ...))
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (10);
INSERT INTO t1 VALUES (20);
INSERT INTO t1 VALUES (30);
((SELECT a FROM t1) UNION (SELECT a FROM t1));
a
10
20
30
(SELECT * FROM t1 UNION SELECT * FROM t1);
a
10
20
30
((SELECT a FROM t1) LIMIT 1);
a
10
SELECT * FROM (SELECT 1 UNION (SELECT 2 UNION SELECT 3)) t1;
1
1
2
3
DROP TABLE t1;
#
# test of several levels of ORDER BY / LIMIT
#
create table t1 (a int, b int);
insert into t1 (a,b) values (1, 100), (2, 200), (3,30), (4,4);
select a,b from t1 order by 1 limit 3;
a b
1 100
2 200
3 30
(select a,b from t1 order by 1 limit 3) order by 2 limit 2;
a b
3 30
1 100
(select 10,1000 union select a,b from t1 order by 1 limit 3) order by 2 limit 2;
10 1000
3 30
1 100
((select a,b from t1 order by 1 limit 3) order by 2 limit 2) order by 1 limit 1;
a b
1 100
((select a,b from t1 order by 1 limit 3) order by 2 limit 2) order by 1;
a b
1 100
3 30
drop table t1;
MDEV-16359 wrong result (extra rows) on the query with UNION and brackets Due to an obvious bug in st_select_lex_unit::reset_distinct() a union without duplicates of more than 2 selects could return a result set containing duplicate rows if this union was enclosed in ().
2018-08-03 23:27:24 -07:00
#
# MDEV-16359: union with 3 selects in brackets
#
select 1 union select 1 union select 1;
1
1
(select 1 union select 1 union select 1);
1
1
((select 1) union (select 1) union (select 1));
1
1
MDEV-16357 LIMIT and ORDER BY clause is ignored on a query with UNION when using brackets Do not create master unit for select if it has already one.
2018-11-06 09:40:07 -08:00
#
# MDEV-16357: union in brackets with tail
# union with tail in brackets
#
CREATE TABLE t1 (a int);
INSERT INTO t1 VALUES(1),(2),(3),(4);
CREATE TABLE t2 (a int);
INSERT INTO t2 VALUES (4),(5),(6),(7);
(SELECT a FROM t1 UNION SELECT a FROM t2) LIMIT 1;
a
1
(SELECT a FROM t1 UNION SELECT a FROM t2) ORDER BY a DESC;
a
7
6
5
4
3
2
1
(SELECT a FROM t1 UNION SELECT a FROM t2 LIMIT 1);
a
1
DROP TABLE t1,t2;
MDEV-19324 Wrong results from query, using brackets with ORDER BY ..LIMIT If a select query was of the form (SELECT ... ORDER BY ...) LIMIT ... then in most cases it returned incorrect result. It happened because SELECT ... ORDER BY ... was wrapped into a select with materialized derived table: SELECT ... ORDER BY ... => SELECT * FROM (SELECT ... ORDER BY ...) dt. Yet for any materialized derived table ORDER BY without LIMIT is ignored. This patch resolves the problem by the conversion (SELECT ... ORDER BY ...) LIMIT ... => SELECT ... ORDER BY ... LIMIT ... at the parser stage. Similarly ((SELECT ... UNION ...) ORDER BY ...) LIMIT ... is converted to (SELECT ... UNION ...) ORDER BY ... LIMIT ... This conversion optimizes execution of the query because the result of (SELECT ... UNION ...) ORDER BY ... is not materialized into a temporary table anymore.
2019-04-26 17:55:12 -07:00
#
# MDEV-19324: ((SELECT ...) ORDER BY col ) LIMIT n
#
create table t1 (a int);
insert into t1 values (10),(20),(30);
select a from t1 order by a desc limit 1;
a
30
explain extended select a from t1 order by a desc limit 1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using filesort
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` order by `test`.`t1`.`a` desc limit 1
explain format=json select a from t1 order by a desc limit 1;
EXPLAIN
{
"query_block": {
"select_id": 1,
"read_sorted_file": {
"filesort": {
"sort_key": "t1.a desc",
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 3,
"filtered": 100
}
}
}
}
}
(select a from t1 order by a desc) limit 1;
a
30
explain extended (select a from t1 order by a desc) limit 1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using filesort
Warnings:
Note 1003 (select `test`.`t1`.`a` AS `a` from `test`.`t1` order by `test`.`t1`.`a` desc limit 1)
explain format=json (select a from t1 order by a desc) limit 1;
EXPLAIN
{
"query_block": {
"select_id": 1,
"read_sorted_file": {
"filesort": {
"sort_key": "t1.a desc",
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 3,
"filtered": 100
}
}
}
}
}
(select a from t1 where a=20 union select a from t1) order by a desc limit 1;
a
30
explain extended (select a from t1 where a=20 union select a from t1) order by a desc limit 1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
2 UNION t1 ALL NULL NULL NULL NULL 3 100.00
NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL NULL Using filesort
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where `test`.`t1`.`a` = 20 union /* select#2 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` order by `a` desc limit 1
explain format=json (select a from t1 where a=20 union select a from t1) order by a desc limit 1;
EXPLAIN
{
"query_block": {
"union_result": {
"table_name": "<union1,2>",
"access_type": "ALL",
"query_specifications": [
{
"query_block": {
"select_id": 1,
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 3,
"filtered": 100,
"attached_condition": "t1.a = 20"
}
}
},
{
"query_block": {
"select_id": 2,
"operation": "UNION",
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 3,
"filtered": 100
}
}
}
]
}
}
}
((select a from t1 where a=20 union select a from t1) order by a desc) limit 1;
a
30
explain extended ((select a from t1 where a=20 union select a from t1) order by a desc) limit 1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3 100.00 Using where
2 UNION t1 ALL NULL NULL NULL NULL 3 100.00
NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL NULL Using filesort
Warnings:
Note 1003 (/* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where `test`.`t1`.`a` = 20) union /* select#2 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` order by `a` desc limit 1
explain format=json ((select a from t1 where a=20 union select a from t1) order by a desc) limit 1;
EXPLAIN
{
"query_block": {
"union_result": {
"table_name": "<union1,2>",
"access_type": "ALL",
"query_specifications": [
{
"query_block": {
"select_id": 1,
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 3,
"filtered": 100,
"attached_condition": "t1.a = 20"
}
}
},
{
"query_block": {
"select_id": 2,
"operation": "UNION",
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 3,
"filtered": 100
}
}
}
]
}
}
}
drop table t1;
MDEV-19363 Assertion `select_lex' failed in LEX::pop_select This patch corrects the patch for MDEV-19324. The latter did not work properly in the cases when the transformation (SELECT ... ORDER BY ...) LIMIT ... => SELECT ... ORDER BY ... LIMIT ... was applied to the operands of a set operation.
2019-05-01 18:20:06 -07:00
#
# MDEV-19363: ((SELECT ...) ORDER BY col ) LIMIT n UNION ...
#
create table t1 (pk int);
insert into t1 values (5),(4),(1),(2),(3);
((select * from t1 order by pk) limit 2) union (select * from t1 where pk > 4);
pk
1
2
5
explain extended ((select * from t1 order by pk) limit 2) union (select * from t1 where pk > 4);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 5 100.00 Using filesort
2 UNION t1 ALL NULL NULL NULL NULL 5 100.00 Using where
NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 (/* select#1 */ select `test`.`t1`.`pk` AS `pk` from `test`.`t1` order by `test`.`t1`.`pk` limit 2) union (/* select#2 */ select `test`.`t1`.`pk` AS `pk` from `test`.`t1` where `test`.`t1`.`pk` > 4)
explain format=json ((select * from t1 order by pk) limit 2) union (select * from t1 where pk > 4);
EXPLAIN
{
"query_block": {
"union_result": {
"table_name": "<union1,2>",
"access_type": "ALL",
"query_specifications": [
{
"query_block": {
"select_id": 1,
"read_sorted_file": {
"filesort": {
"sort_key": "t1.pk",
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 5,
"filtered": 100
}
}
}
}
},
{
"query_block": {
"select_id": 2,
"operation": "UNION",
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 5,
"filtered": 100,
"attached_condition": "t1.pk > 4"
}
}
}
]
}
}
}
drop table t1;
MDEV-18689 Simple query with extra brackets stopped working Parenthesis around table names and derived tables should be allowed in FROM clauses and some other context as it was in earlier versions. Returned test queries that used such parenthesis in 10.3 to their original form. Adjusted test results accordingly.
2019-05-06 11:14:39 -07:00
#
# MDEV-18689: parenthesis around table names and derived tables
#
select * from ( mysql.db );
Host Db User Select_priv Insert_priv Update_priv Delete_priv Create_priv Drop_priv Grant_priv References_priv Index_priv Alter_priv Create_tmp_table_priv Lock_tables_priv Create_view_priv Show_view_priv Create_routine_priv Alter_routine_priv Execute_priv Event_priv Trigger_priv Delete_history_priv
% test Y Y Y Y Y Y N Y Y Y Y Y Y Y Y N N Y Y Y
% test\_% Y Y Y Y Y Y N Y Y Y Y Y Y Y Y N N Y Y Y
create table t1 (a int);
insert into t1 values (7), (2), (7);
select * from (t1);
a
7
2
7
select * from ((t1));
a
7
2
7
select * from (t1 t) where t.a > 5;
a
7
7
select * from ((t1 t)) where t.a > 5;
a
7
7
select * from ((select a, sum(a) from t1 group by a) t);
a sum(a)
2 2
7 14
select * from (((select a, sum(a) from t1 group by a) t));
a sum(a)
2 2
7 14
update (t1 t) set t.a=t.a+1;
select * from t1;
a
8
3
8
drop table t1;
MDEV-11953: support of brackets in UNION/EXCEPT/INTERSECT operations
2018-05-22 19:08:39 +02:00
# End of 10.4 tests
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