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Commit 30a63d6e authored by Varun Gupta's avatar Varun Gupta
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More tests added for subqueries

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mysql-test/main/sort_nest.result
View file @ 30a63d6e
......@@ -2024,104 +2024,8 @@ a b b t1.b + t2.b
1 1 1 2
0 0 0 0
#
# Subqueries used in order by clause
# Tests with Subqueries
#
set use_sort_nest=1;
EXPLAIN SELECT t1.a, t2.b, t1.b, t1.b + t2.b
FROM t1,t2, t3
WHERE t1.a=t2.b and t2.a=t3.a
ORDER BY (select A.a+t1.b from t1 A limit 1)
LIMIT 5;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 5 Using temporary; Using filesort
1 PRIMARY t2 ALL NULL NULL NULL NULL 5 Using where; Using join buffer (flat, BNL join)
1 PRIMARY t3 ref a a 5 test.t2.a 1 Using index
2 DEPENDENT SUBQUERY A ALL NULL NULL NULL NULL 5
EXPLAIN FORMAT=JSON SELECT t1.a, t2.b, t1.b, t1.b + t2.b
FROM t1,t2, t3
WHERE t1.a=t2.b and t2.a=t3.a
ORDER BY (select A.a+t1.b from t1 A limit 1)
LIMIT 5;
EXPLAIN
{
"query_block": {
"select_id": 1,
"filesort": {
"sort_key": "(subquery#2)",
"temporary_table": {
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 5,
"filtered": 100
},
"block-nl-join": {
"table": {
"table_name": "t2",
"access_type": "ALL",
"rows": 5,
"filtered": 100
},
"buffer_type": "flat",
"buffer_size": "119",
"join_type": "BNL",
"attached_condition": "t2.b = t1.a and t2.a is not null"
},
"table": {
"table_name": "t3",
"access_type": "ref",
"possible_keys": ["a"],
"key": "a",
"key_length": "5",
"used_key_parts": ["a"],
"ref": ["test.t2.a"],
"rows": 1,
"filtered": 100,
"using_index": true
},
"subqueries": [
{
"expression_cache": {
"state": "uninitialized",
"query_block": {
"select_id": 2,
"table": {
"table_name": "A",
"access_type": "ALL",
"rows": 5,
"filtered": 100
}
}
}
}
]
}
}
}
}
SELECT t1.a, t2.b, t1.b, t1.b + t2.b
FROM t1,t2, t3
WHERE t1.a=t2.b and t2.a=t3.a
ORDER BY (select A.a+t1.b from t1 A limit 1)
LIMIT 5;
a b b t1.b + t2.b
0 0 0 0
1 1 1 2
2 2 2 4
3 3 3 6
4 4 4 8
set use_sort_nest=0;
SELECT t1.a, t2.b, t1.b, t1.b + t2.b
FROM t1,t2, t3
WHERE t1.a=t2.b and t2.a=t3.a
ORDER BY (select A.a+t1.b from t1 A limit 1)
LIMIT 5;
a b b t1.b + t2.b
0 0 0 0
1 1 1 2
2 2 2 4
3 3 3 6
4 4 4 8
#
# Dependent subqueries cannot have a sort-nest
#
......@@ -2236,4 +2140,256 @@ t u v x
2 2 2 2
1 1 1 1
0 0 0 0
#
# sort-nest(t2,t1) and independent subquery in the SELECT list
#
set use_sort_nest=1;
EXPLAIN SELECT (SELECT A.a FROM t3 A WHERE A.a > 5 limit 1) as x,
t2.b, t1.b, t3.a
FROM t1,t2,t3
WHERE t1.a = t2.a
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 5
1 PRIMARY t2 ALL NULL NULL NULL NULL 5 Using where; Using join buffer (flat, BNL join)
1 PRIMARY <sort-nest> ALL NULL NULL NULL NULL 1 Using filesort
1 PRIMARY t3 index NULL a 5 NULL 10 Using index
2 SUBQUERY A range a a 5 NULL 4 Using where; Using index
SELECT (SELECT A.a FROM t3 A WHERE A.a > 5 limit 1) as x,
t2.b, t1.b, t3.a
FROM t1,t2,t3
WHERE t1.a = t2.a
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
x b b a
6 4 4 0
6 4 4 1
6 4 4 2
6 4 4 3
6 4 4 4
#
# sort-nest(t2,t1) and dependent subquery in the SELECT list
#
set use_sort_nest=1;
EXPLAIN SELECT (SELECT A.a FROM t3 A WHERE A.a = t1.b limit 1) as x,
t2.b, t1.b, t3.a
FROM t1,t2,t3
WHERE t1.a = t2.a and t2.c=t3.c
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 5
1 PRIMARY t2 ALL NULL NULL NULL NULL 5 Using where; Using join buffer (flat, BNL join)
1 PRIMARY <sort-nest> ALL NULL NULL NULL NULL 1 Using filesort
1 PRIMARY t3 ALL NULL NULL NULL NULL 10 Using where
2 DEPENDENT SUBQUERY A ref a a 5 sort-nest.b 1 Using index
SELECT (SELECT A.a FROM t3 A WHERE A.a = t1.b limit 1) as x,
t2.b, t1.b, t3.a
FROM t1,t2,t3
WHERE t1.a = t2.a and t2.c=t3.c
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
x b b a
4 4 4 4
3 3 3 3
2 2 2 2
1 1 1 1
0 0 0 0
set use_sort_nest= 0;
SELECT (SELECT A.a FROM t3 A WHERE A.a = t1.b limit 1) as x,
t2.b, t1.b, t3.a
FROM t1,t2,t3
WHERE t1.a = t2.a and t2.c=t3.c
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
x b b a
4 4 4 4
3 3 3 3
2 2 2 2
1 1 1 1
0 0 0 0
#
# Dependent Subquery attached outside the sort-nest, references inside
# subquery changed to sort-nest field items
#
set use_sort_nest=1;
EXPLAIN SELECT t2.b, t1.b, t3.a
FROM t1,t2,t3
WHERE t1.a = t2.a AND t2.c = t3.c AND
t1.b=(SELECT A.a FROM t3 A WHERE A.b > 1 and t3.b=t1.b limit 1)
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 5
1 PRIMARY t2 ALL NULL NULL NULL NULL 5 Using where; Using join buffer (flat, BNL join)
1 PRIMARY <sort-nest> ALL NULL NULL NULL NULL 1 Using filesort
1 PRIMARY t3 ALL NULL NULL NULL NULL 10 Using where
2 DEPENDENT SUBQUERY A ALL NULL NULL NULL NULL 10 Using where
EXPLAIN FORMAT=JSON SELECT t2.b, t1.b, t3.a
FROM t1,t2,t3
WHERE t1.a = t2.a AND t2.c = t3.c AND
t1.b=(SELECT A.a FROM t3 A WHERE A.b > 1 and t3.b=t1.b limit 1)
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
EXPLAIN
{
"query_block": {
"select_id": 1,
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 5,
"filtered": 100
},
"block-nl-join": {
"table": {
"table_name": "t2",
"access_type": "ALL",
"rows": 5,
"filtered": 100
},
"buffer_type": "flat",
"buffer_size": "119",
"join_type": "BNL",
"attached_condition": "t2.a = t1.a"
},
"read_sorted_file": {
"filesort": {
"sort_key": "`sort-nest`.b desc, `sort-nest`.b desc",
"table": {
"table_name": "<sort-nest>",
"access_type": "ALL",
"rows": 1,
"filtered": 100
}
}
},
"table": {
"table_name": "t3",
"access_type": "ALL",
"rows": 10,
"filtered": 100,
"attached_condition": "t3.c = `sort-nest`.c and `sort-nest`.b = (subquery#2)"
},
"subqueries": [
{
"expression_cache": {
"state": "uninitialized",
"query_block": {
"select_id": 2,
"outer_ref_condition": "t3.b = `sort-nest`.b",
"table": {
"table_name": "A",
"access_type": "ALL",
"rows": 10,
"filtered": 89.844,
"attached_condition": "A.b > 1"
}
}
}
}
]
}
}
SELECT t2.b, t1.b, t3.a
FROM t1,t2,t3
WHERE t1.a = t2.a AND t2.c = t3.c AND
t1.b=(SELECT A.a FROM t3 A WHERE A.b > 1 and t3.b=t1.b limit 1)
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
b b a
2 2 2
set use_sort_nest= 0;
SELECT t2.b, t1.b, t3.a
FROM t1,t2,t3
WHERE t1.a = t2.a AND t2.c = t3.c AND
t1.b=(SELECT A.a FROM t3 A WHERE A.b > 1 and t3.b=t1.b limit 1)
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
b b a
2 2 2
#
# sort-nest(t2,t1) and independent subquery in the ORDER BY clause
#
# Subquery will be a constant in ORDER BY and will be removed
set use_sort_nest=1;
EXPLAIN SELECT t2.b, t1.b, t3.c
FROM t1,t2,t3
WHERE t1.a = t2.a and t2.c=t3.c
ORDER BY t2.b, t1.b,
(SELECT A.a FROM t3 A WHERE A.a < 5 limit 1)
LIMIT 5;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 5
1 PRIMARY t2 ALL NULL NULL NULL NULL 5 Using where; Using join buffer (flat, BNL join)
1 PRIMARY <sort-nest> ALL NULL NULL NULL NULL 1 Using filesort
1 PRIMARY t3 ALL NULL NULL NULL NULL 10 Using where
2 SUBQUERY A range a a 5 NULL 5 Using where; Using index
SELECT t2.b, t1.b, t3.c
FROM t1,t2,t3
WHERE t1.a = t2.a and t2.c=t3.c
ORDER BY t2.b, t1.b,
(SELECT A.a FROM t3 A WHERE A.a < 5 limit 1)
LIMIT 5;
b b c
0 0 0
1 1 1
2 2 2
3 3 3
4 4 4
set use_sort_nest= 0;
SELECT t2.b, t1.b, t3.c
FROM t1,t2,t3
WHERE t1.a = t2.a and t2.c=t3.c
ORDER BY t2.b, t1.b,
(SELECT A.a FROM t3 A WHERE A.a < 5 limit 1)
LIMIT 5;
b b c
0 0 0
1 1 1
2 2 2
3 3 3
4 4 4
#
# sort-nest(t2,t1) and dependent subquery in the ORDER BY clause
#
# Subquery is expensive to evaluate, so don't use a sort-nest
set use_sort_nest=1;
EXPLAIN SELECT t2.b, t1.b, t3.c
FROM t1,t2,t3
WHERE t1.a = t2.a and t2.c=t3.c
ORDER BY t2.b, t1.b,
(SELECT A.a FROM t3 A WHERE A.a = t1.c limit 1)
LIMIT 5;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 5 Using temporary; Using filesort
1 PRIMARY t2 ALL NULL NULL NULL NULL 5 Using where; Using join buffer (flat, BNL join)
1 PRIMARY t3 ALL NULL NULL NULL NULL 10 Using where; Using join buffer (incremental, BNL join)
2 DEPENDENT SUBQUERY A ref a a 5 test.t1.c 1 Using index
SELECT t2.b, t1.b, t3.c
FROM t1,t2,t3
WHERE t1.a = t2.a and t2.c=t3.c
ORDER BY t2.b, t1.b,
(SELECT A.a FROM t3 A WHERE A.a = t1.c limit 1)
LIMIT 5;
b b c
0 0 0
1 1 1
2 2 2
3 3 3
4 4 4
set use_sort_nest= 0;
SELECT t2.b, t1.b, t3.c
FROM t1,t2,t3
WHERE t1.a = t2.a and t2.c=t3.c
ORDER BY t2.b, t1.b,
(SELECT A.a FROM t3 A WHERE A.a = t1.c limit 1)
LIMIT 5;
b b c
0 0 0
1 1 1
2 2 2
3 3 3
4 4 4
drop table t0,t1,t2,t3,t4;
mysql-test/main/sort_nest.test
View file @ 30a63d6e
......@@ -652,23 +652,9 @@ set use_sort_nest=0;
eval $query;
--echo #
--echo # Subqueries used in order by clause
--echo # Tests with Subqueries
--echo #
let $query= SELECT t1.a, t2.b, t1.b, t1.b + t2.b
FROM t1,t2, t3
WHERE t1.a=t2.b and t2.a=t3.a
ORDER BY (select A.a+t1.b from t1 A limit 1)
LIMIT 5;
set use_sort_nest=1;
eval EXPLAIN $query;
eval EXPLAIN FORMAT=JSON $query;
eval $query;
set use_sort_nest=0;
eval $query;
--echo #
--echo # Dependent subqueries cannot have a sort-nest
--echo #
......@@ -727,4 +713,102 @@ eval $query;
set use_sort_nest=0;
eval $query;
--echo #
--echo # sort-nest(t2,t1) and independent subquery in the SELECT list
--echo #
let $query=
SELECT (SELECT A.a FROM t3 A WHERE A.a > 5 limit 1) as x,
t2.b, t1.b, t3.a
FROM t1,t2,t3
WHERE t1.a = t2.a
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
set use_sort_nest=1;
eval EXPLAIN $query;
eval $query;
--echo #
--echo # sort-nest(t2,t1) and dependent subquery in the SELECT list
--echo #
let $query=
SELECT (SELECT A.a FROM t3 A WHERE A.a = t1.b limit 1) as x,
t2.b, t1.b, t3.a
FROM t1,t2,t3
WHERE t1.a = t2.a and t2.c=t3.c
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
set use_sort_nest=1;
eval EXPLAIN $query;
eval $query;
set use_sort_nest= 0;
eval $query;
--echo #
--echo # Dependent Subquery attached outside the sort-nest, references inside
--echo # subquery changed to sort-nest field items
--echo #
let $query=
SELECT t2.b, t1.b, t3.a
FROM t1,t2,t3
WHERE t1.a = t2.a AND t2.c = t3.c AND
t1.b=(SELECT A.a FROM t3 A WHERE A.b > 1 and t3.b=t1.b limit 1)
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
set use_sort_nest=1;
eval EXPLAIN $query;
eval EXPLAIN FORMAT=JSON $query;
eval $query;
set use_sort_nest= 0;
eval $query;
--echo #
--echo # sort-nest(t2,t1) and independent subquery in the ORDER BY clause
--echo #
--echo # Subquery will be a constant in ORDER BY and will be removed
let $query=
SELECT t2.b, t1.b, t3.c
FROM t1,t2,t3
WHERE t1.a = t2.a and t2.c=t3.c
ORDER BY t2.b, t1.b,
(SELECT A.a FROM t3 A WHERE A.a < 5 limit 1)
LIMIT 5;
set use_sort_nest=1;
eval EXPLAIN $query;
eval $query;
set use_sort_nest= 0;
eval $query;
--echo #
--echo # sort-nest(t2,t1) and dependent subquery in the ORDER BY clause
--echo #
--echo # Subquery is expensive to evaluate, so don't use a sort-nest
let $query=
SELECT t2.b, t1.b, t3.c
FROM t1,t2,t3
WHERE t1.a = t2.a and t2.c=t3.c
ORDER BY t2.b, t1.b,
(SELECT A.a FROM t3 A WHERE A.a = t1.c limit 1)
LIMIT 5;
set use_sort_nest=1;
eval EXPLAIN $query;
eval $query;
set use_sort_nest= 0;
eval $query;
drop table t0,t1,t2,t3,t4;
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