1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
#
# Nested Loops semi-join subquery evaluation tests
#
--disable_warnings
drop table if exists t0, t1, t2, t10, t11, t12;
--enable_warnings
#
# 1. Subqueries that are converted into semi-joins
#
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1(a int, b int);
insert into t1 values (0,0),(1,1),(2,2);
create table t2 as select * from t1;
create table t11(a int, b int);
create table t10 (pk int, a int, primary key(pk));
insert into t10 select a,a from t0;
create table t12 like t10;
insert into t12 select * from t10;
--echo Flattened because of dependency, t10=func(t1)
explain select * from t1 where a in (select pk from t10);
select * from t1 where a in (select pk from t10);
--echo A confluent case of dependency
explain select * from t1 where a in (select a from t10 where pk=12);
select * from t1 where a in (select a from t10 where pk=12);
--echo An empty table inside
explain select * from t1 where a in (select a from t11);
select * from t1 where a in (select a from t11);
explain select * from t1 where a in (select pk from t10) and b in (select pk from t10);
select * from t1 where a in (select pk from t10) and b in (select pk from t10);
--echo flattening a nested subquery
explain select * from t1 where a in (select pk from t10 where t10.a in (select pk from t12));
select * from t1 where a in (select pk from t10 where t10.a in (select pk from t12));
--echo flattening subquery w/ several tables
explain extended select * from t1 where a in (select t10.pk from t10, t12 where t12.pk=t10.a);
--echo subqueries within outer joins go into ON expr.
# TODO: psergey: check if case conversions like those are ok (it broke on windows)
# TODO: This crashes the server: jaypipes... ?
#select * from t1 left join (t2 A, t2 B) on ( A.a= t1.a and B.a in (select pk from t10));
#--replace_result a A b B
#explain extended
#select * from t1 left join (t2 A, t2 B) on ( A.a= t1.a and B.a in (select pk from t10));
# TODO: psergey: check if case conversions like those are ok (it broke on windows)
#--echo t2 should be wrapped into OJ-nest, so we have "t1 LJ (t2 J t10)"
#select * from t1 left join t2 on (t2.a= t1.a and t2.a in (select pk from t10));
#--replace_result a A b B
#explain extended
#select * from t1 left join t2 on (t2.a= t1.a and t2.a in (select pk from t10));
#--echo we shouldn't flatten if we're going to get a join of > MAX_TABLES.
#explain select * from
# t1 s00, t1 s01, t1 s02, t1 s03, t1 s04,t1 s05,t1 s06,t1 s07,t1 s08,t1 s09,
# t1 s10, t1 s11, t1 s12, t1 s13, t1 s14,t1 s15,t1 s16,t1 s17,t1 s18,t1 s19,
# t1 s20, t1 s21, t1 s22, t1 s23, t1 s24,t1 s25,t1 s26,t1 s27,t1 s28,t1 s29,
# t1 s30, t1 s31, t1 s32, t1 s33, t1 s34,t1 s35,t1 s36,t1 s37,t1 s38,t1 s39,
# t1 s40, t1 s41, t1 s42, t1 s43, t1 s44,t1 s45,t1 s46,t1 s47,t1 s48,t1 s49
#where
# s00.a in (
# select m00.a from
# t1 m00, t1 m01, t1 m02, t1 m03, t1 m04,t1 m05,t1 m06,t1 m07,t1 m08,t1 m09,
# t1 m10, t1 m11, t1 m12, t1 m13, t1 m14,t1 m15,t1 m16,t1 m17,t1 m18,t1 m19
# );
select * from
t1 left join t2 on (t2.a= t1.a and t2.a in (select pk from t10))
where t1.a < 5;
# Try I2O orders
insert into t1 select (A.a + 10 * B.a),1 from t0 A, t0 B;
explain extended select * from t1 where a in (select pk from t10 where pk<3);
drop table t0, t1;
drop table t10, t11, t12;
|