0 |
(1 row)
+-- verify correct results for null and NaN inputs
+select sum(null::int4) from generate_series(1,3);
+ sum
+-----
+
+(1 row)
+
+select sum(null::int8) from generate_series(1,3);
+ sum
+-----
+
+(1 row)
+
+select sum(null::numeric) from generate_series(1,3);
+ sum
+-----
+
+(1 row)
+
+select sum(null::float8) from generate_series(1,3);
+ sum
+-----
+
+(1 row)
+
+select avg(null::int4) from generate_series(1,3);
+ avg
+-----
+
+(1 row)
+
+select avg(null::int8) from generate_series(1,3);
+ avg
+-----
+
+(1 row)
+
+select avg(null::numeric) from generate_series(1,3);
+ avg
+-----
+
+(1 row)
+
+select avg(null::float8) from generate_series(1,3);
+ avg
+-----
+
+(1 row)
+
+select sum('NaN'::numeric) from generate_series(1,3);
+ sum
+-----
+ NaN
+(1 row)
+
+select avg('NaN'::numeric) from generate_series(1,3);
+ avg
+-----
+ NaN
+(1 row)
+
-- SQL2003 binary aggregates
SELECT regr_count(b, a) FROM aggtest;
regr_count
group by ten
having exists (select 1 from onek b
where sum(distinct a.four + b.four) = b.four);
-ERROR: aggregates not allowed in WHERE clause
+ERROR: aggregate functions are not allowed in WHERE
LINE 4: where sum(distinct a.four + b.four) = b.four)...
^
-- Test handling of sublinks within outer-level aggregates.
select
(select max((select i.unique2 from tenk1 i where i.unique1 = o.unique1)))
from tenk1 o;
- ?column?
-----------
- 9999
+ max
+------
+ 9999
(1 row)
--
y BIT(4)
);
-- empty case
-SELECT
+SELECT
BIT_AND(i2) AS "?",
BIT_OR(i4) AS "?"
FROM bitwise_test;
t | t | t | t | t | t | t | t | t
(1 row)
-CREATE TEMPORARY TABLE bool_test(
+CREATE TEMPORARY TABLE bool_test(
b1 BOOL,
b2 BOOL,
b3 BOOL,
(1 row)
--
--- Test several cases that should be optimized into indexscans instead of
--- the generic aggregate implementation. We can't actually verify that they
--- are done as indexscans, but we can check that the results are correct.
+-- Test cases that should be optimized into indexscans instead of
+-- the generic aggregate implementation.
--
-- Basic cases
+explain (costs off)
+ select min(unique1) from tenk1;
+ QUERY PLAN
+------------------------------------------------------------
+ Result
+ InitPlan 1 (returns $0)
+ -> Limit
+ -> Index Only Scan using tenk1_unique1 on tenk1
+ Index Cond: (unique1 IS NOT NULL)
+(5 rows)
+
+select min(unique1) from tenk1;
+ min
+-----
+ 0
+(1 row)
+
+explain (costs off)
+ select max(unique1) from tenk1;
+ QUERY PLAN
+---------------------------------------------------------------------
+ Result
+ InitPlan 1 (returns $0)
+ -> Limit
+ -> Index Only Scan Backward using tenk1_unique1 on tenk1
+ Index Cond: (unique1 IS NOT NULL)
+(5 rows)
+
select max(unique1) from tenk1;
max
------
9999
(1 row)
+explain (costs off)
+ select max(unique1) from tenk1 where unique1 < 42;
+ QUERY PLAN
+------------------------------------------------------------------------
+ Result
+ InitPlan 1 (returns $0)
+ -> Limit
+ -> Index Only Scan Backward using tenk1_unique1 on tenk1
+ Index Cond: ((unique1 IS NOT NULL) AND (unique1 < 42))
+(5 rows)
+
select max(unique1) from tenk1 where unique1 < 42;
max
-----
41
(1 row)
+explain (costs off)
+ select max(unique1) from tenk1 where unique1 > 42;
+ QUERY PLAN
+------------------------------------------------------------------------
+ Result
+ InitPlan 1 (returns $0)
+ -> Limit
+ -> Index Only Scan Backward using tenk1_unique1 on tenk1
+ Index Cond: ((unique1 IS NOT NULL) AND (unique1 > 42))
+(5 rows)
+
select max(unique1) from tenk1 where unique1 > 42;
max
------
9999
(1 row)
+explain (costs off)
+ select max(unique1) from tenk1 where unique1 > 42000;
+ QUERY PLAN
+---------------------------------------------------------------------------
+ Result
+ InitPlan 1 (returns $0)
+ -> Limit
+ -> Index Only Scan Backward using tenk1_unique1 on tenk1
+ Index Cond: ((unique1 IS NOT NULL) AND (unique1 > 42000))
+(5 rows)
+
select max(unique1) from tenk1 where unique1 > 42000;
max
-----
(1 row)
-- multi-column index (uses tenk1_thous_tenthous)
+explain (costs off)
+ select max(tenthous) from tenk1 where thousand = 33;
+ QUERY PLAN
+----------------------------------------------------------------------------
+ Result
+ InitPlan 1 (returns $0)
+ -> Limit
+ -> Index Only Scan Backward using tenk1_thous_tenthous on tenk1
+ Index Cond: ((thousand = 33) AND (tenthous IS NOT NULL))
+(5 rows)
+
select max(tenthous) from tenk1 where thousand = 33;
max
------
9033
(1 row)
+explain (costs off)
+ select min(tenthous) from tenk1 where thousand = 33;
+ QUERY PLAN
+--------------------------------------------------------------------------
+ Result
+ InitPlan 1 (returns $0)
+ -> Limit
+ -> Index Only Scan using tenk1_thous_tenthous on tenk1
+ Index Cond: ((thousand = 33) AND (tenthous IS NOT NULL))
+(5 rows)
+
select min(tenthous) from tenk1 where thousand = 33;
min
-----
(1 row)
-- check parameter propagation into an indexscan subquery
+explain (costs off)
+ select f1, (select min(unique1) from tenk1 where unique1 > f1) AS gt
+ from int4_tbl;
+ QUERY PLAN
+-----------------------------------------------------------------------------------------
+ Seq Scan on int4_tbl
+ SubPlan 2
+ -> Result
+ InitPlan 1 (returns $1)
+ -> Limit
+ -> Index Only Scan using tenk1_unique1 on tenk1
+ Index Cond: ((unique1 IS NOT NULL) AND (unique1 > int4_tbl.f1))
+(7 rows)
+
select f1, (select min(unique1) from tenk1 where unique1 > f1) AS gt
-from int4_tbl;
+ from int4_tbl;
f1 | gt
-------------+----
0 | 1
(5 rows)
-- check some cases that were handled incorrectly in 8.3.0
+explain (costs off)
+ select distinct max(unique2) from tenk1;
+ QUERY PLAN
+---------------------------------------------------------------------
+ HashAggregate
+ Group Key: $0
+ InitPlan 1 (returns $0)
+ -> Limit
+ -> Index Only Scan Backward using tenk1_unique2 on tenk1
+ Index Cond: (unique2 IS NOT NULL)
+ -> Result
+(7 rows)
+
select distinct max(unique2) from tenk1;
max
------
9999
(1 row)
+explain (costs off)
+ select max(unique2) from tenk1 order by 1;
+ QUERY PLAN
+---------------------------------------------------------------------
+ Sort
+ Sort Key: ($0)
+ InitPlan 1 (returns $0)
+ -> Limit
+ -> Index Only Scan Backward using tenk1_unique2 on tenk1
+ Index Cond: (unique2 IS NOT NULL)
+ -> Result
+(7 rows)
+
select max(unique2) from tenk1 order by 1;
max
------
9999
(1 row)
+explain (costs off)
+ select max(unique2) from tenk1 order by max(unique2);
+ QUERY PLAN
+---------------------------------------------------------------------
+ Sort
+ Sort Key: ($0)
+ InitPlan 1 (returns $0)
+ -> Limit
+ -> Index Only Scan Backward using tenk1_unique2 on tenk1
+ Index Cond: (unique2 IS NOT NULL)
+ -> Result
+(7 rows)
+
select max(unique2) from tenk1 order by max(unique2);
max
------
9999
(1 row)
+explain (costs off)
+ select max(unique2) from tenk1 order by max(unique2)+1;
+ QUERY PLAN
+---------------------------------------------------------------------
+ Sort
+ Sort Key: (($0 + 1))
+ InitPlan 1 (returns $0)
+ -> Limit
+ -> Index Only Scan Backward using tenk1_unique2 on tenk1
+ Index Cond: (unique2 IS NOT NULL)
+ -> Result
+(7 rows)
+
select max(unique2) from tenk1 order by max(unique2)+1;
max
------
9999
(1 row)
+explain (costs off)
+ select max(unique2), generate_series(1,3) as g from tenk1 order by g desc;
+ QUERY PLAN
+---------------------------------------------------------------------
+ Sort
+ Sort Key: (generate_series(1, 3))
+ InitPlan 1 (returns $0)
+ -> Limit
+ -> Index Only Scan Backward using tenk1_unique2 on tenk1
+ Index Cond: (unique2 IS NOT NULL)
+ -> Result
+(7 rows)
+
select max(unique2), generate_series(1,3) as g from tenk1 order by g desc;
max | g
------+---
9999 | 1
(3 rows)
+-- try it on an inheritance tree
+create table minmaxtest(f1 int);
+create table minmaxtest1() inherits (minmaxtest);
+create table minmaxtest2() inherits (minmaxtest);
+create table minmaxtest3() inherits (minmaxtest);
+create index minmaxtesti on minmaxtest(f1);
+create index minmaxtest1i on minmaxtest1(f1);
+create index minmaxtest2i on minmaxtest2(f1 desc);
+create index minmaxtest3i on minmaxtest3(f1) where f1 is not null;
+insert into minmaxtest values(11), (12);
+insert into minmaxtest1 values(13), (14);
+insert into minmaxtest2 values(15), (16);
+insert into minmaxtest3 values(17), (18);
+explain (costs off)
+ select min(f1), max(f1) from minmaxtest;
+ QUERY PLAN
+----------------------------------------------------------------------------------------------
+ Result
+ InitPlan 1 (returns $0)
+ -> Limit
+ -> Merge Append
+ Sort Key: minmaxtest.f1
+ -> Index Only Scan using minmaxtesti on minmaxtest
+ Index Cond: (f1 IS NOT NULL)
+ -> Index Only Scan using minmaxtest1i on minmaxtest1
+ Index Cond: (f1 IS NOT NULL)
+ -> Index Only Scan Backward using minmaxtest2i on minmaxtest2
+ Index Cond: (f1 IS NOT NULL)
+ -> Index Only Scan using minmaxtest3i on minmaxtest3
+ Index Cond: (f1 IS NOT NULL)
+ InitPlan 2 (returns $1)
+ -> Limit
+ -> Merge Append
+ Sort Key: minmaxtest_1.f1
+ -> Index Only Scan Backward using minmaxtesti on minmaxtest minmaxtest_1
+ Index Cond: (f1 IS NOT NULL)
+ -> Index Only Scan Backward using minmaxtest1i on minmaxtest1 minmaxtest1_1
+ Index Cond: (f1 IS NOT NULL)
+ -> Index Only Scan using minmaxtest2i on minmaxtest2 minmaxtest2_1
+ Index Cond: (f1 IS NOT NULL)
+ -> Index Only Scan Backward using minmaxtest3i on minmaxtest3 minmaxtest3_1
+ Index Cond: (f1 IS NOT NULL)
+(25 rows)
+
+select min(f1), max(f1) from minmaxtest;
+ min | max
+-----+-----
+ 11 | 18
+(1 row)
+
+-- DISTINCT doesn't do anything useful here, but it shouldn't fail
+explain (costs off)
+ select distinct min(f1), max(f1) from minmaxtest;
+ QUERY PLAN
+----------------------------------------------------------------------------------------------
+ HashAggregate
+ Group Key: $0, $1
+ InitPlan 1 (returns $0)
+ -> Limit
+ -> Merge Append
+ Sort Key: minmaxtest.f1
+ -> Index Only Scan using minmaxtesti on minmaxtest
+ Index Cond: (f1 IS NOT NULL)
+ -> Index Only Scan using minmaxtest1i on minmaxtest1
+ Index Cond: (f1 IS NOT NULL)
+ -> Index Only Scan Backward using minmaxtest2i on minmaxtest2
+ Index Cond: (f1 IS NOT NULL)
+ -> Index Only Scan using minmaxtest3i on minmaxtest3
+ Index Cond: (f1 IS NOT NULL)
+ InitPlan 2 (returns $1)
+ -> Limit
+ -> Merge Append
+ Sort Key: minmaxtest_1.f1
+ -> Index Only Scan Backward using minmaxtesti on minmaxtest minmaxtest_1
+ Index Cond: (f1 IS NOT NULL)
+ -> Index Only Scan Backward using minmaxtest1i on minmaxtest1 minmaxtest1_1
+ Index Cond: (f1 IS NOT NULL)
+ -> Index Only Scan using minmaxtest2i on minmaxtest2 minmaxtest2_1
+ Index Cond: (f1 IS NOT NULL)
+ -> Index Only Scan Backward using minmaxtest3i on minmaxtest3 minmaxtest3_1
+ Index Cond: (f1 IS NOT NULL)
+ -> Result
+(27 rows)
+
+select distinct min(f1), max(f1) from minmaxtest;
+ min | max
+-----+-----
+ 11 | 18
+(1 row)
+
+drop table minmaxtest cascade;
+NOTICE: drop cascades to 3 other objects
+DETAIL: drop cascades to table minmaxtest1
+drop cascades to table minmaxtest2
+drop cascades to table minmaxtest3
+-- check for correct detection of nested-aggregate errors
+select max(min(unique1)) from tenk1;
+ERROR: aggregate function calls cannot be nested
+LINE 1: select max(min(unique1)) from tenk1;
+ ^
+select (select max(min(unique1)) from int8_tbl) from tenk1;
+ERROR: aggregate function calls cannot be nested
+LINE 1: select (select max(min(unique1)) from int8_tbl) from tenk1;
+ ^
--
-- Test combinations of DISTINCT and/or ORDER BY
--
(1 row)
select pg_get_viewdef('agg_view1'::regclass);
- pg_get_viewdef
---------------------------------------------------------------------------------------------------------------------------------------------------------
- SELECT aggfns(v.a, v.b, v.c) AS aggfns FROM (VALUES (1,3,'foo'::text), (0,NULL::integer,NULL::text), (2,2,'bar'::text), (3,1,'baz'::text)) v(a, b, c);
+ pg_get_viewdef
+---------------------------------------------------------------------------------------------------------------------
+ SELECT aggfns(v.a, v.b, v.c) AS aggfns +
+ FROM ( VALUES (1,3,'foo'::text), (0,NULL::integer,NULL::text), (2,2,'bar'::text), (3,1,'baz'::text)) v(a, b, c);
(1 row)
create or replace view agg_view1 as
(1 row)
select pg_get_viewdef('agg_view1'::regclass);
- pg_get_viewdef
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
- SELECT aggfns(DISTINCT v.a, v.b, v.c) AS aggfns FROM (VALUES (1,3,'foo'::text), (0,NULL::integer,NULL::text), (2,2,'bar'::text), (3,1,'baz'::text)) v(a, b, c), generate_series(1, 3) i(i);
+ pg_get_viewdef
+---------------------------------------------------------------------------------------------------------------------
+ SELECT aggfns(DISTINCT v.a, v.b, v.c) AS aggfns +
+ FROM ( VALUES (1,3,'foo'::text), (0,NULL::integer,NULL::text), (2,2,'bar'::text), (3,1,'baz'::text)) v(a, b, c),+
+ generate_series(1, 3) i(i);
(1 row)
create or replace view agg_view1 as
(1 row)
select pg_get_viewdef('agg_view1'::regclass);
- pg_get_viewdef
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
- SELECT aggfns(DISTINCT v.a, v.b, v.c ORDER BY v.b) AS aggfns FROM (VALUES (1,3,'foo'::text), (0,NULL::integer,NULL::text), (2,2,'bar'::text), (3,1,'baz'::text)) v(a, b, c), generate_series(1, 3) i(i);
+ pg_get_viewdef
+---------------------------------------------------------------------------------------------------------------------
+ SELECT aggfns(DISTINCT v.a, v.b, v.c ORDER BY v.b) AS aggfns +
+ FROM ( VALUES (1,3,'foo'::text), (0,NULL::integer,NULL::text), (2,2,'bar'::text), (3,1,'baz'::text)) v(a, b, c),+
+ generate_series(1, 3) i(i);
(1 row)
create or replace view agg_view1 as
(1 row)
select pg_get_viewdef('agg_view1'::regclass);
- pg_get_viewdef
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
- SELECT aggfns(v.a, v.b, v.c ORDER BY (v.b + 1)) AS aggfns FROM (VALUES (1,3,'foo'::text), (0,NULL::integer,NULL::text), (2,2,'bar'::text), (3,1,'baz'::text)) v(a, b, c);
+ pg_get_viewdef
+---------------------------------------------------------------------------------------------------------------------
+ SELECT aggfns(v.a, v.b, v.c ORDER BY (v.b + 1)) AS aggfns +
+ FROM ( VALUES (1,3,'foo'::text), (0,NULL::integer,NULL::text), (2,2,'bar'::text), (3,1,'baz'::text)) v(a, b, c);
(1 row)
create or replace view agg_view1 as
(1 row)
select pg_get_viewdef('agg_view1'::regclass);
- pg_get_viewdef
----------------------------------------------------------------------------------------------------------------------------------------------------------------------
- SELECT aggfns(v.a, v.a, v.c ORDER BY v.b) AS aggfns FROM (VALUES (1,3,'foo'::text), (0,NULL::integer,NULL::text), (2,2,'bar'::text), (3,1,'baz'::text)) v(a, b, c);
+ pg_get_viewdef
+---------------------------------------------------------------------------------------------------------------------
+ SELECT aggfns(v.a, v.a, v.c ORDER BY v.b) AS aggfns +
+ FROM ( VALUES (1,3,'foo'::text), (0,NULL::integer,NULL::text), (2,2,'bar'::text), (3,1,'baz'::text)) v(a, b, c);
(1 row)
create or replace view agg_view1 as
(1 row)
select pg_get_viewdef('agg_view1'::regclass);
- pg_get_viewdef
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
- SELECT aggfns(v.a, v.b, v.c ORDER BY v.c USING ~<~ NULLS LAST) AS aggfns FROM (VALUES (1,3,'foo'::text), (0,NULL::integer,NULL::text), (2,2,'bar'::text), (3,1,'baz'::text)) v(a, b, c);
+ pg_get_viewdef
+---------------------------------------------------------------------------------------------------------------------
+ SELECT aggfns(v.a, v.b, v.c ORDER BY v.c USING ~<~ NULLS LAST) AS aggfns +
+ FROM ( VALUES (1,3,'foo'::text), (0,NULL::integer,NULL::text), (2,2,'bar'::text), (3,1,'baz'::text)) v(a, b, c);
(1 row)
create or replace view agg_view1 as
(1 row)
select pg_get_viewdef('agg_view1'::regclass);
- pg_get_viewdef
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
- SELECT aggfns(DISTINCT v.a, v.b, v.c ORDER BY v.a, v.c USING ~<~ NULLS LAST, v.b) AS aggfns FROM (VALUES (1,3,'foo'::text), (0,NULL::integer,NULL::text), (2,2,'bar'::text), (3,1,'baz'::text)) v(a, b, c), generate_series(1, 2) i(i);
+ pg_get_viewdef
+---------------------------------------------------------------------------------------------------------------------
+ SELECT aggfns(DISTINCT v.a, v.b, v.c ORDER BY v.a, v.c USING ~<~ NULLS LAST, v.b) AS aggfns +
+ FROM ( VALUES (1,3,'foo'::text), (0,NULL::integer,NULL::text), (2,2,'bar'::text), (3,1,'baz'::text)) v(a, b, c),+
+ generate_series(1, 2) i(i);
(1 row)
drop view agg_view1;
LINE 1: select aggfns(distinct a,a,c order by a,b)
^
-- string_agg tests
-select string_agg(a) from (values('aaaa'),('bbbb'),('cccc')) g(a);
- string_agg
---------------
- aaaabbbbcccc
-(1 row)
-
select string_agg(a,',') from (values('aaaa'),('bbbb'),('cccc')) g(a);
string_agg
----------------
aaaa,bbbb,cccc
(1 row)
-select string_agg(a,',') from (values(null),(null),('bbbb'),('cccc')) g(a);
+select string_agg(a,'AB') from (values(null),(null),('bbbb'),('cccc')) g(a);
string_agg
------------
- bbbb,cccc
+ bbbbABcccc
(1 row)
select string_agg(a,',') from (values(null),(null)) g(a);
(1 row)
-- check some implicit casting cases, as per bug #5564
-select string_agg(distinct f1 order by f1) from varchar_tbl; -- ok
+select string_agg(distinct f1, ',' order by f1) from varchar_tbl; -- ok
string_agg
------------
- aababcd
+ a,ab,abcd
(1 row)
-select string_agg(distinct f1::text order by f1) from varchar_tbl; -- not ok
+select string_agg(distinct f1::text, ',' order by f1) from varchar_tbl; -- not ok
ERROR: in an aggregate with DISTINCT, ORDER BY expressions must appear in argument list
-LINE 1: select string_agg(distinct f1::text order by f1) from varcha...
- ^
-select string_agg(distinct f1 order by f1::text) from varchar_tbl; -- not ok
+LINE 1: select string_agg(distinct f1::text, ',' order by f1) from v...
+ ^
+select string_agg(distinct f1, ',' order by f1::text) from varchar_tbl; -- not ok
ERROR: in an aggregate with DISTINCT, ORDER BY expressions must appear in argument list
-LINE 1: select string_agg(distinct f1 order by f1::text) from varcha...
- ^
-select string_agg(distinct f1::text order by f1::text) from varchar_tbl; -- ok
+LINE 1: select string_agg(distinct f1, ',' order by f1::text) from v...
+ ^
+select string_agg(distinct f1::text, ',' order by f1::text) from varchar_tbl; -- ok
+ string_agg
+------------
+ a,ab,abcd
+(1 row)
+
+-- string_agg bytea tests
+create table bytea_test_table(v bytea);
+select string_agg(v, '') from bytea_test_table;
+ string_agg
+------------
+
+(1 row)
+
+insert into bytea_test_table values(decode('ff','hex'));
+select string_agg(v, '') from bytea_test_table;
+ string_agg
+------------
+ \xff
+(1 row)
+
+insert into bytea_test_table values(decode('aa','hex'));
+select string_agg(v, '') from bytea_test_table;
string_agg
------------
- aababcd
+ \xffaa
+(1 row)
+
+select string_agg(v, NULL) from bytea_test_table;
+ string_agg
+------------
+ \xffaa
+(1 row)
+
+select string_agg(v, decode('ee', 'hex')) from bytea_test_table;
+ string_agg
+------------
+ \xffeeaa
+(1 row)
+
+drop table bytea_test_table;
+-- FILTER tests
+select min(unique1) filter (where unique1 > 100) from tenk1;
+ min
+-----
+ 101
+(1 row)
+
+select ten, sum(distinct four) filter (where four::text ~ '123') from onek a
+group by ten;
+ ten | sum
+-----+-----
+ 0 |
+ 1 |
+ 2 |
+ 3 |
+ 4 |
+ 5 |
+ 6 |
+ 7 |
+ 8 |
+ 9 |
+(10 rows)
+
+select ten, sum(distinct four) filter (where four > 10) from onek a
+group by ten
+having exists (select 1 from onek b where sum(distinct a.four) = b.four);
+ ten | sum
+-----+-----
+ 0 |
+ 2 |
+ 4 |
+ 6 |
+ 8 |
+(5 rows)
+
+select max(foo COLLATE "C") filter (where (bar collate "POSIX") > '0')
+from (values ('a', 'b')) AS v(foo,bar);
+ max
+-----
+ a
+(1 row)
+
+-- outer reference in FILTER (PostgreSQL extension)
+select (select count(*)
+ from (values (1)) t0(inner_c))
+from (values (2),(3)) t1(outer_c); -- inner query is aggregation query
+ count
+-------
+ 1
+ 1
+(2 rows)
+
+select (select count(*) filter (where outer_c <> 0)
+ from (values (1)) t0(inner_c))
+from (values (2),(3)) t1(outer_c); -- outer query is aggregation query
+ count
+-------
+ 2
+(1 row)
+
+select (select count(inner_c) filter (where outer_c <> 0)
+ from (values (1)) t0(inner_c))
+from (values (2),(3)) t1(outer_c); -- inner query is aggregation query
+ count
+-------
+ 1
+ 1
+(2 rows)
+
+select
+ (select max((select i.unique2 from tenk1 i where i.unique1 = o.unique1))
+ filter (where o.unique1 < 10))
+from tenk1 o; -- outer query is aggregation query
+ max
+------
+ 9998
+(1 row)
+
+-- subquery in FILTER clause (PostgreSQL extension)
+select sum(unique1) FILTER (WHERE
+ unique1 IN (SELECT unique1 FROM onek where unique1 < 100)) FROM tenk1;
+ sum
+------
+ 4950
+(1 row)
+
+-- exercise lots of aggregate parts with FILTER
+select aggfns(distinct a,b,c order by a,c using ~<~,b) filter (where a > 1)
+ from (values (1,3,'foo'),(0,null,null),(2,2,'bar'),(3,1,'baz')) v(a,b,c),
+ generate_series(1,2) i;
+ aggfns
+---------------------------
+ {"(2,2,bar)","(3,1,baz)"}
+(1 row)
+
+-- variadic aggregates
+select least_agg(q1,q2) from int8_tbl;
+ least_agg
+-------------------
+ -4567890123456789
+(1 row)
+
+select least_agg(variadic array[q1,q2]) from int8_tbl;
+ least_agg
+-------------------
+ -4567890123456789
(1 row)
projects / postgresql / blobdiff