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impala/testdata/workloads/functional-query/queries/QueryTest/subquery.test
Dimitris Tsirogiannis 2ab66c4ca2 Add support for uncorrelated EXISTS subqueries 
This commit adds support for uncorrelated EXISTS subqueries in Impala.
Uncorrelated EXISTS subqueries are rewritten using a CROSS JOIN.
Uncorrelated NOT EXISTS subqueries are not supported.

Change-Id: I0003dcdc0fa5cc99931b9a9f4deddbcd42572490
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4140
Reviewed-by: Dimitris Tsirogiannis <dtsirogiannis@cloudera.com>
Tested-by: jenkins
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4186
2014-09-05 12:36:18 -07:00

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====
---- QUERY
# Uncorrelated IN subquery
select a.id, a.int_col, a.string_col
from functional.alltypessmall a
where a.id in (select id from functional.alltypestiny where bool_col = false)
and a.id < 5
---- RESULTS
1,1,'1'
3,3,'3'
---- TYPES
INT, INT, STRING
====
---- QUERY
# Uncorrelated IN subquery with IS NOT NULL predicate
select a.id, a.int_col, a.string_col
from functional.alltypes a
where a.int_col in (select int_col from functional.alltypesagg where int_col is not null)
and a.id < 5
---- RESULTS
1,1,'1'
2,2,'2'
3,3,'3'
4,4,'4'
---- TYPES
INT, INT, STRING
====
---- QUERY
# Uncorrelated IN subquery with IS NULL predicate (empty result)
select a.id, a.int_col, a.string_col
from functional.alltypes a
where a.id in (select int_col from functional.alltypesagg where int_col is null)
and a.id < 5
---- RESULTS
---- TYPES
INT, INT, STRING
====
---- QUERY
# Uncorrelated NOT IN subquery
select id, year, month
from functional.alltypessmall
where id not in (select id from functional.alltypestiny where bool_col = false)
and id < 5
---- RESULTS
0,2009,1
2,2009,1
4,2009,1
---- TYPES
INT, INT, INT
====
---- QUERY
# Correlated IN subquery
select s.id, s.bool_col, s.int_col, s.date_string_col
from functional.alltypessmall s
where s.id in (select id from functional.alltypestiny t where t.int_col = s.int_col)
and s.bool_col = false
---- RESULTS
1,false,1,'01/01/09'
---- TYPES
INT, BOOLEAN, INT, STRING
====
---- QUERY
# Correlated NOT IN subquery
select s.id, s.bool_col, s.int_col
from functional.alltypessmall s
where s.id not in
(select id
from functional.alltypestiny t
where s.int_col = t.int_col and t.bool_col = false)
and s.id < 5
order by s.id
---- RESULTS
0,true,0
2,true,2
3,false,3
4,true,4
---- TYPES
INT, BOOLEAN, INT
====
---- QUERY
# Correlated EXISTS subquery
select count(*)
from functional.alltypestiny t
where exists (select * from functional.alltypessmall s where t.int_col = s.int_col)
and id < 4
---- RESULTS
4
---- TYPES
BIGINT
====
---- QUERY
# Correlated NOT EXISTS subquery
select id, int_col
from functional.alltypessmall t
where not exists (select 1 from functional.alltypestiny s where t.id = s.id)
and month = 1 and int_col < 5
order by id
---- RESULTS
10,0
11,1
12,2
13,3
14,4
20,0
21,1
22,2
23,3
24,4
---- TYPES
INT, INT
====
---- QUERY
# Uncorrelated EXISTS
select id
from functional.alltypestiny t
where exists (select 1 from functional.alltypessmall where bool_col = false)
and bool_col = true
order by id
---- RESULTS
0
2
4
6
---- TYPES
INT
====
---- QUERY
# Uncorrelated EXISTS that returns an empty set
select 1
from functional.alltypestiny t
where exists (select null from functional.alltypessmall where id < 0)
and t.id > 0
---- RESULTS
---- TYPES
TINYINT
====
---- QUERY
# Uncorrelated aggregate subquery
select count(*) from
functional.alltypessmall t
where t.id < (select max(id) from functional.alltypestiny)
and t.bool_col = true
---- RESULTS
4
---- TYPES
BIGINT
====
---- QUERY
# Uncorrelated aggregate subquery with count
select id, int_col, year, month
from functional.alltypessmall
where int_col = (select count(*) from functional.alltypestiny)
order by id
---- RESULTS
8,8,2009,1
18,8,2009,1
33,8,2009,2
43,8,2009,2
58,8,2009,3
68,8,2009,3
83,8,2009,4
93,8,2009,4
---- TYPES
INT, INT, INT, INT
====
---- QUERY
# Correlated aggregate subquery
select id, int_col, year, month
from functional.alltypessmall s
where s.int_col = (select count(*) from functional.alltypestiny t where s.id = t.id)
order by id
---- RESULTS
1,1,2009,1
10,0,2009,1
20,0,2009,1
25,0,2009,2
35,0,2009,2
45,0,2009,2
50,0,2009,3
60,0,2009,3
70,0,2009,3
75,0,2009,4
85,0,2009,4
95,0,2009,4
---- TYPES
INT, INT, INT, INT
====
---- QUERY
# Multiple subquery predicates
select id, bool_col, int_col, date_string_col
from functional.alltypessmall s
where s.id in (select id from functional.alltypestiny where bool_col = true)
and exists
(select *
from functional.alltypesagg g
where s.int_col = g.int_col and g.bigint_col < 100)
and s.int_col < (select count(*) from functional.alltypes where month = 1)
---- RESULTS
2,true,2,'01/01/09'
4,true,4,'01/01/09'
6,true,6,'01/01/09'
---- TYPES
INT, BOOLEAN, INT, STRING
====
---- QUERY
# Multiple nesting levels
select month, count(*)
from functional.alltypessmall s
where id in
(select id
from functional.alltypestiny t
where t.int_col <
(select min(int_col)
from functional.alltypesagg a
where a.bool_col = false and exists
(select * from functional.alltypes b where b.id = a.id)))
group by month
---- RESULTS
1,4
---- TYPES
INT, BIGINT
====
---- QUERY
# Multiple tables in outer select block and in subqueries
select t.id, t.month, t.year
from functional.alltypestiny t left outer join functional.alltypessmall s
on s.id = t.id
where t.int_col <
(select avg(a.int_col) * 2
from functional.alltypesagg a left outer join functional.alltypes b
on a.bigint_col = b.bigint_col
where a.id = t.id and b.int_col < 10)
order by t.id
---- RESULTS
1,1,2009
2,2,2009
3,2,2009
4,3,2009
5,3,2009
6,4,2009
7,4,2009
---- TYPES
INT, INT, INT
====
---- QUERY
# Subquery in the WITH clause
with t as
(select *
from functional.alltypessmall
where id in
(select id
from functional.alltypestiny
where bool_col = false))
select id, month, year from t where t.int_col =
(select count(*) from functional.alltypestiny where id < 5)
---- RESULTS
5,1,2009
---- TYPES
INT, INT, INT
====
---- QUERY
# Subquery in an inline view
select s.id, s.year
from functional.alltypessmall s left outer join
(select *
from functional.alltypestiny t
where t.id in (select id from functional.alltypesagg)) b
on (s.id = b.id)
where s.int_col < (select max(int_col) from functional.alltypes) and s.id < 10
order by s.id
---- RESULTS
0,2009
1,2009
2,2009
3,2009
4,2009
5,2009
6,2009
7,2009
8,2009
---- TYPES
INT, INT
====
---- QUERY
# Subquery returning a decimal
select id, double_col
from functional.alltypestiny
where double_col < (select min(d3) from functional.decimal_tbl)
order by id
---- RESULTS
0,0
2,0
4,0
6,0
---- TYPES
INT, DOUBLE
====
---- QUERY
# Compare a decimal with the result of a subquery
select d1, d2, d3
from functional.decimal_tbl
where d3 < (select max(double_col) from functional.alltypestiny)
---- RESULTS
1234,2222,1.2345678900
---- TYPES
DECIMAL, DECIMAL, DECIMAL
====
---- QUERY
# Distinct in the outer select block
select distinct bool_col
from functional.alltypestiny t
where 1 < (select count(*) from functional.alltypessmall)
---- RESULTS
false
true
---- TYPES
BOOLEAN
====
---- QUERY
# Distinct with an unqualified star in the outer select block
select distinct *
from functional.alltypestiny t
where 1 < (select avg(distinct id) from functional.alltypessmall)
and id < 2
---- RESULTS
0,true,0,0,0,0,0,0,'01/01/09','0',2009-01-01 00:00:00,2009,1
1,false,1,1,1,10,1.100000023841858,10.1,'01/01/09','1',2009-01-01 00:01:00,2009,1
---- TYPES
INT, BOOLEAN, TINYINT, SMALLINT, INT, BIGINT, FLOAT, DOUBLE, STRING, STRING, TIMESTAMP, INT, INT
====
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