~drizzle-trunk/drizzle/development

#

# 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;