postgresql/src/test/regress/sql/aggregates.sql

--
-- AGGREGATES
--

SELECT avg(four) AS avg_1 FROM onek;

SELECT avg(a) AS avg_32 FROM aggtest WHERE a < 100;

-- In 7.1, avg(float4) is computed using float8 arithmetic.
-- Round the result to 3 digits to avoid platform-specific results.

SELECT avg(b)::numeric(10,3) AS avg_107_943 FROM aggtest;

SELECT avg(gpa) AS avg_3_4 FROM ONLY student;


SELECT sum(four) AS sum_1500 FROM onek;
SELECT sum(a) AS sum_198 FROM aggtest;
SELECT sum(b) AS avg_431_773 FROM aggtest;
SELECT sum(gpa) AS avg_6_8 FROM ONLY student;

SELECT max(four) AS max_3 FROM onek;
SELECT max(a) AS max_100 FROM aggtest;
SELECT max(aggtest.b) AS max_324_78 FROM aggtest;
SELECT max(student.gpa) AS max_3_7 FROM student;

SELECT stddev_pop(b) FROM aggtest;
SELECT stddev_samp(b) FROM aggtest;
SELECT var_pop(b) FROM aggtest;
SELECT var_samp(b) FROM aggtest;

SELECT stddev_pop(b::numeric) FROM aggtest;
SELECT stddev_samp(b::numeric) FROM aggtest;
SELECT var_pop(b::numeric) FROM aggtest;
SELECT var_samp(b::numeric) FROM aggtest;

-- population variance is defined for a single tuple, sample variance
-- is not
SELECT var_pop(1.0), var_samp(2.0);
SELECT stddev_pop(3.0::numeric), stddev_samp(4.0::numeric);

-- verify correct results for null and NaN inputs
select sum(null::int4) from generate_series(1,3);
select sum(null::int8) from generate_series(1,3);
select sum(null::numeric) from generate_series(1,3);
select sum(null::float8) from generate_series(1,3);
select avg(null::int4) from generate_series(1,3);
select avg(null::int8) from generate_series(1,3);
select avg(null::numeric) from generate_series(1,3);
select avg(null::float8) from generate_series(1,3);
select sum('NaN'::numeric) from generate_series(1,3);
select avg('NaN'::numeric) from generate_series(1,3);

-- SQL2003 binary aggregates
SELECT regr_count(b, a) FROM aggtest;
SELECT regr_sxx(b, a) FROM aggtest;
SELECT regr_syy(b, a) FROM aggtest;
SELECT regr_sxy(b, a) FROM aggtest;
SELECT regr_avgx(b, a), regr_avgy(b, a) FROM aggtest;
SELECT regr_r2(b, a) FROM aggtest;
SELECT regr_slope(b, a), regr_intercept(b, a) FROM aggtest;
SELECT covar_pop(b, a), covar_samp(b, a) FROM aggtest;
SELECT corr(b, a) FROM aggtest;

SELECT count(four) AS cnt_1000 FROM onek;
SELECT count(DISTINCT four) AS cnt_4 FROM onek;

select ten, count(*), sum(four) from onek
group by ten order by ten;

select ten, count(four), sum(DISTINCT four) from onek
group by ten order by ten;

-- user-defined aggregates
SELECT newavg(four) AS avg_1 FROM onek;
SELECT newsum(four) AS sum_1500 FROM onek;
SELECT newcnt(four) AS cnt_1000 FROM onek;
SELECT newcnt(*) AS cnt_1000 FROM onek;
SELECT oldcnt(*) AS cnt_1000 FROM onek;
SELECT sum2(q1,q2) FROM int8_tbl;

-- test for outer-level aggregates

-- this should work
select ten, sum(distinct four) from onek a
group by ten
having exists (select 1 from onek b where sum(distinct a.four) = b.four);

-- this should fail because subquery has an agg of its own in WHERE
select ten, sum(distinct four) from onek a
group by ten
having exists (select 1 from onek b
               where sum(distinct a.four + b.four) = b.four);

-- Test handling of sublinks within outer-level aggregates.
-- Per bug report from Daniel Grace.
select
  (select max((select i.unique2 from tenk1 i where i.unique1 = o.unique1)))
from tenk1 o;

--
-- test for bitwise integer aggregates
--
CREATE TEMPORARY TABLE bitwise_test(
  i2 INT2,
  i4 INT4,
  i8 INT8,
  i INTEGER,
  x INT2,
  y BIT(4)
);

-- empty case
SELECT
  BIT_AND(i2) AS "?",
  BIT_OR(i4)  AS "?"
FROM bitwise_test;

COPY bitwise_test FROM STDIN NULL 'null';
1	1	1	1	1	B0101
3	3	3	null	2	B0100
7	7	7	3	4	B1100
\.

SELECT
  BIT_AND(i2) AS "1",
  BIT_AND(i4) AS "1",
  BIT_AND(i8) AS "1",
  BIT_AND(i)  AS "?",
  BIT_AND(x)  AS "0",
  BIT_AND(y)  AS "0100",

  BIT_OR(i2)  AS "7",
  BIT_OR(i4)  AS "7",
  BIT_OR(i8)  AS "7",
  BIT_OR(i)   AS "?",
  BIT_OR(x)   AS "7",
  BIT_OR(y)   AS "1101"
FROM bitwise_test;

--
-- test boolean aggregates
--
-- first test all possible transition and final states

SELECT
  -- boolean and transitions
  -- null because strict
  booland_statefunc(NULL, NULL)  IS NULL AS "t",
  booland_statefunc(TRUE, NULL)  IS NULL AS "t",
  booland_statefunc(FALSE, NULL) IS NULL AS "t",
  booland_statefunc(NULL, TRUE)  IS NULL AS "t",
  booland_statefunc(NULL, FALSE) IS NULL AS "t",
  -- and actual computations
  booland_statefunc(TRUE, TRUE) AS "t",
  NOT booland_statefunc(TRUE, FALSE) AS "t",
  NOT booland_statefunc(FALSE, TRUE) AS "t",
  NOT booland_statefunc(FALSE, FALSE) AS "t";

SELECT
  -- boolean or transitions
  -- null because strict
  boolor_statefunc(NULL, NULL)  IS NULL AS "t",
  boolor_statefunc(TRUE, NULL)  IS NULL AS "t",
  boolor_statefunc(FALSE, NULL) IS NULL AS "t",
  boolor_statefunc(NULL, TRUE)  IS NULL AS "t",
  boolor_statefunc(NULL, FALSE) IS NULL AS "t",
  -- actual computations
  boolor_statefunc(TRUE, TRUE) AS "t",
  boolor_statefunc(TRUE, FALSE) AS "t",
  boolor_statefunc(FALSE, TRUE) AS "t",
  NOT boolor_statefunc(FALSE, FALSE) AS "t";

CREATE TEMPORARY TABLE bool_test(
  b1 BOOL,
  b2 BOOL,
  b3 BOOL,
  b4 BOOL);

-- empty case
SELECT
  BOOL_AND(b1)   AS "n",
  BOOL_OR(b3)    AS "n"
FROM bool_test;

COPY bool_test FROM STDIN NULL 'null';
TRUE	null	FALSE	null
FALSE	TRUE	null	null
null	TRUE	FALSE	null
\.

SELECT
  BOOL_AND(b1)     AS "f",
  BOOL_AND(b2)     AS "t",
  BOOL_AND(b3)     AS "f",
  BOOL_AND(b4)     AS "n",
  BOOL_AND(NOT b2) AS "f",
  BOOL_AND(NOT b3) AS "t"
FROM bool_test;

SELECT
  EVERY(b1)     AS "f",
  EVERY(b2)     AS "t",
  EVERY(b3)     AS "f",
  EVERY(b4)     AS "n",
  EVERY(NOT b2) AS "f",
  EVERY(NOT b3) AS "t"
FROM bool_test;

SELECT
  BOOL_OR(b1)      AS "t",
  BOOL_OR(b2)      AS "t",
  BOOL_OR(b3)      AS "f",
  BOOL_OR(b4)      AS "n",
  BOOL_OR(NOT b2)  AS "f",
  BOOL_OR(NOT b3)  AS "t"
FROM bool_test;

--
-- Test cases that should be optimized into indexscans instead of
-- the generic aggregate implementation.
--

-- Basic cases
explain (costs off)
  select min(unique1) from tenk1;
select min(unique1) from tenk1;
explain (costs off)
  select max(unique1) from tenk1;
select max(unique1) from tenk1;
explain (costs off)
  select max(unique1) from tenk1 where unique1 < 42;
select max(unique1) from tenk1 where unique1 < 42;
explain (costs off)
  select max(unique1) from tenk1 where unique1 > 42;
select max(unique1) from tenk1 where unique1 > 42;
explain (costs off)
  select max(unique1) from tenk1 where unique1 > 42000;
select max(unique1) from tenk1 where unique1 > 42000;

-- multi-column index (uses tenk1_thous_tenthous)
explain (costs off)
  select max(tenthous) from tenk1 where thousand = 33;
select max(tenthous) from tenk1 where thousand = 33;
explain (costs off)
  select min(tenthous) from tenk1 where thousand = 33;
select min(tenthous) from tenk1 where thousand = 33;

-- 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;
select f1, (select min(unique1) from tenk1 where unique1 > f1) AS gt
  from int4_tbl;

-- check some cases that were handled incorrectly in 8.3.0
explain (costs off)
  select distinct max(unique2) from tenk1;
select distinct max(unique2) from tenk1;
explain (costs off)
  select max(unique2) from tenk1 order by 1;
select max(unique2) from tenk1 order by 1;
explain (costs off)
  select max(unique2) from tenk1 order by max(unique2);
select max(unique2) from tenk1 order by max(unique2);
explain (costs off)
  select max(unique2) from tenk1 order by max(unique2)+1;
select max(unique2) from tenk1 order by max(unique2)+1;
explain (costs off)
  select max(unique2), generate_series(1,3) as g from tenk1 order by g desc;
select max(unique2), generate_series(1,3) as g from tenk1 order by g desc;

-- 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;
select min(f1), max(f1) from minmaxtest;

-- DISTINCT doesn't do anything useful here, but it shouldn't fail
explain (costs off)
  select distinct min(f1), max(f1) from minmaxtest;
select distinct min(f1), max(f1) from minmaxtest;

drop table minmaxtest cascade;

-- check for correct detection of nested-aggregate errors
select max(min(unique1)) from tenk1;
select (select max(min(unique1)) from int8_tbl) from tenk1;

--
-- Test removal of redundant GROUP BY columns
--

create temp table t1 (a int, b int, c int, d int, primary key (a, b));
create temp table t2 (x int, y int, z int, primary key (x, y));
create temp table t3 (a int, b int, c int, primary key(a, b) deferrable);

-- Non-primary-key columns can be removed from GROUP BY
explain (costs off) select * from t1 group by a,b,c,d;

-- No removal can happen if the complete PK is not present in GROUP BY
explain (costs off) select a,c from t1 group by a,c,d;

-- Test removal across multiple relations
explain (costs off) select *
from t1 inner join t2 on t1.a = t2.x and t1.b = t2.y
group by t1.a,t1.b,t1.c,t1.d,t2.x,t2.y,t2.z;

-- Test case where t1 can be optimized but not t2
explain (costs off) select t1.*,t2.x,t2.z
from t1 inner join t2 on t1.a = t2.x and t1.b = t2.y
group by t1.a,t1.b,t1.c,t1.d,t2.x,t2.z;

-- Cannot optimize when PK is deferrable
explain (costs off) select * from t3 group by a,b,c;

drop table t1;
drop table t2;
drop table t3;

--
-- Test combinations of DISTINCT and/or ORDER BY
--

select array_agg(a order by b)
  from (values (1,4),(2,3),(3,1),(4,2)) v(a,b);
select array_agg(a order by a)
  from (values (1,4),(2,3),(3,1),(4,2)) v(a,b);
select array_agg(a order by a desc)
  from (values (1,4),(2,3),(3,1),(4,2)) v(a,b);
select array_agg(b order by a desc)
  from (values (1,4),(2,3),(3,1),(4,2)) v(a,b);

select array_agg(distinct a)
  from (values (1),(2),(1),(3),(null),(2)) v(a);
select array_agg(distinct a order by a)
  from (values (1),(2),(1),(3),(null),(2)) v(a);
select array_agg(distinct a order by a desc)
  from (values (1),(2),(1),(3),(null),(2)) v(a);
select array_agg(distinct a order by a desc nulls last)
  from (values (1),(2),(1),(3),(null),(2)) v(a);

-- multi-arg aggs, strict/nonstrict, distinct/order by

select aggfstr(a,b,c)
  from (values (1,3,'foo'),(0,null,null),(2,2,'bar'),(3,1,'baz')) v(a,b,c);
select aggfns(a,b,c)
  from (values (1,3,'foo'),(0,null,null),(2,2,'bar'),(3,1,'baz')) v(a,b,c);

select aggfstr(distinct a,b,c)
  from (values (1,3,'foo'),(0,null,null),(2,2,'bar'),(3,1,'baz')) v(a,b,c),
       generate_series(1,3) i;
select aggfns(distinct a,b,c)
  from (values (1,3,'foo'),(0,null,null),(2,2,'bar'),(3,1,'baz')) v(a,b,c),
       generate_series(1,3) i;

select aggfstr(distinct a,b,c order by b)
  from (values (1,3,'foo'),(0,null,null),(2,2,'bar'),(3,1,'baz')) v(a,b,c),
       generate_series(1,3) i;
select aggfns(distinct a,b,c order by b)
  from (values (1,3,'foo'),(0,null,null),(2,2,'bar'),(3,1,'baz')) v(a,b,c),
       generate_series(1,3) i;

-- test specific code paths

select aggfns(distinct a,a,c order by c using ~<~,a)
  from (values (1,3,'foo'),(0,null,null),(2,2,'bar'),(3,1,'baz')) v(a,b,c),
       generate_series(1,2) i;
select aggfns(distinct a,a,c order by c using ~<~)
  from (values (1,3,'foo'),(0,null,null),(2,2,'bar'),(3,1,'baz')) v(a,b,c),
       generate_series(1,2) i;
select aggfns(distinct a,a,c order by a)
  from (values (1,3,'foo'),(0,null,null),(2,2,'bar'),(3,1,'baz')) v(a,b,c),
       generate_series(1,2) i;
select aggfns(distinct a,b,c order by a,c using ~<~,b)
  from (values (1,3,'foo'),(0,null,null),(2,2,'bar'),(3,1,'baz')) v(a,b,c),
       generate_series(1,2) i;

-- check node I/O via view creation and usage, also deparsing logic

create view agg_view1 as
  select aggfns(a,b,c)
    from (values (1,3,'foo'),(0,null,null),(2,2,'bar'),(3,1,'baz')) v(a,b,c);

select * from agg_view1;
select pg_get_viewdef('agg_view1'::regclass);

create or replace view agg_view1 as
  select aggfns(distinct a,b,c)
    from (values (1,3,'foo'),(0,null,null),(2,2,'bar'),(3,1,'baz')) v(a,b,c),
         generate_series(1,3) i;

select * from agg_view1;
select pg_get_viewdef('agg_view1'::regclass);

create or replace view agg_view1 as
  select aggfns(distinct a,b,c order by b)
    from (values (1,3,'foo'),(0,null,null),(2,2,'bar'),(3,1,'baz')) v(a,b,c),
         generate_series(1,3) i;

select * from agg_view1;
select pg_get_viewdef('agg_view1'::regclass);

create or replace view agg_view1 as
  select aggfns(a,b,c order by b+1)
    from (values (1,3,'foo'),(0,null,null),(2,2,'bar'),(3,1,'baz')) v(a,b,c);

select * from agg_view1;
select pg_get_viewdef('agg_view1'::regclass);

create or replace view agg_view1 as
  select aggfns(a,a,c order by b)
    from (values (1,3,'foo'),(0,null,null),(2,2,'bar'),(3,1,'baz')) v(a,b,c);

select * from agg_view1;
select pg_get_viewdef('agg_view1'::regclass);

create or replace view agg_view1 as
  select aggfns(a,b,c order by c using ~<~)
    from (values (1,3,'foo'),(0,null,null),(2,2,'bar'),(3,1,'baz')) v(a,b,c);

select * from agg_view1;
select pg_get_viewdef('agg_view1'::regclass);

create or replace view agg_view1 as
  select aggfns(distinct a,b,c order by a,c using ~<~,b)
    from (values (1,3,'foo'),(0,null,null),(2,2,'bar'),(3,1,'baz')) v(a,b,c),
         generate_series(1,2) i;

select * from agg_view1;
select pg_get_viewdef('agg_view1'::regclass);

drop view agg_view1;

-- incorrect DISTINCT usage errors

select aggfns(distinct a,b,c order by i)
  from (values (1,1,'foo')) v(a,b,c), generate_series(1,2) i;
select aggfns(distinct a,b,c order by a,b+1)
  from (values (1,1,'foo')) v(a,b,c), generate_series(1,2) i;
select aggfns(distinct a,b,c order by a,b,i,c)
  from (values (1,1,'foo')) v(a,b,c), generate_series(1,2) i;
select aggfns(distinct a,a,c order by a,b)
  from (values (1,1,'foo')) v(a,b,c), generate_series(1,2) i;

-- string_agg tests
select string_agg(a,',') from (values('aaaa'),('bbbb'),('cccc')) g(a);
select string_agg(a,',') from (values('aaaa'),(null),('bbbb'),('cccc')) g(a);
select string_agg(a,'AB') from (values(null),(null),('bbbb'),('cccc')) g(a);
select string_agg(a,',') from (values(null),(null)) g(a);

-- 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::text, ',' order by f1) from varchar_tbl;  -- not ok
select string_agg(distinct f1, ',' order by f1::text) from varchar_tbl;  -- not ok
select string_agg(distinct f1::text, ',' order by f1::text) from varchar_tbl;  -- ok

-- string_agg bytea tests
create table bytea_test_table(v bytea);

select string_agg(v, '') from bytea_test_table;

insert into bytea_test_table values(decode('ff','hex'));

select string_agg(v, '') from bytea_test_table;

insert into bytea_test_table values(decode('aa','hex'));

select string_agg(v, '') from bytea_test_table;
select string_agg(v, NULL) from bytea_test_table;
select string_agg(v, decode('ee', 'hex')) from bytea_test_table;

drop table bytea_test_table;

-- FILTER tests

select min(unique1) filter (where unique1 > 100) from tenk1;

select ten, sum(distinct four) filter (where four::text ~ '123') from onek a
group by ten;

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);

select max(foo COLLATE "C") filter (where (bar collate "POSIX") > '0')
from (values ('a', 'b')) AS v(foo,bar);

-- 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
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
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
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

-- subquery in FILTER clause (PostgreSQL extension)
select sum(unique1) FILTER (WHERE
  unique1 IN (SELECT unique1 FROM onek where unique1 < 100)) FROM tenk1;

-- 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;

-- ordered-set aggregates

select p, percentile_cont(p) within group (order by x::float8)
from generate_series(1,5) x,
     (values (0::float8),(0.1),(0.25),(0.4),(0.5),(0.6),(0.75),(0.9),(1)) v(p)
group by p order by p;

select p, percentile_cont(p order by p) within group (order by x)  -- error
from generate_series(1,5) x,
     (values (0::float8),(0.1),(0.25),(0.4),(0.5),(0.6),(0.75),(0.9),(1)) v(p)
group by p order by p;

select p, sum() within group (order by x::float8)  -- error
from generate_series(1,5) x,
     (values (0::float8),(0.1),(0.25),(0.4),(0.5),(0.6),(0.75),(0.9),(1)) v(p)
group by p order by p;

select p, percentile_cont(p,p)  -- error
from generate_series(1,5) x,
     (values (0::float8),(0.1),(0.25),(0.4),(0.5),(0.6),(0.75),(0.9),(1)) v(p)
group by p order by p;

select percentile_cont(0.5) within group (order by b) from aggtest;
select percentile_cont(0.5) within group (order by b), sum(b) from aggtest;
select percentile_cont(0.5) within group (order by thousand) from tenk1;
select percentile_disc(0.5) within group (order by thousand) from tenk1;
select rank(3) within group (order by x)
from (values (1),(1),(2),(2),(3),(3),(4)) v(x);
select cume_dist(3) within group (order by x)
from (values (1),(1),(2),(2),(3),(3),(4)) v(x);
select percent_rank(3) within group (order by x)
from (values (1),(1),(2),(2),(3),(3),(4),(5)) v(x);
select dense_rank(3) within group (order by x)
from (values (1),(1),(2),(2),(3),(3),(4)) v(x);

select percentile_disc(array[0,0.1,0.25,0.5,0.75,0.9,1]) within group (order by thousand)
from tenk1;
select percentile_cont(array[0,0.25,0.5,0.75,1]) within group (order by thousand)
from tenk1;
select percentile_disc(array[[null,1,0.5],[0.75,0.25,null]]) within group (order by thousand)
from tenk1;
select percentile_cont(array[0,1,0.25,0.75,0.5,1,0.3,0.32,0.35,0.38,0.4]) within group (order by x)
from generate_series(1,6) x;

select ten, mode() within group (order by string4) from tenk1 group by ten;

select percentile_disc(array[0.25,0.5,0.75]) within group (order by x)
from unnest('{fred,jim,fred,jack,jill,fred,jill,jim,jim,sheila,jim,sheila}'::text[]) u(x);

-- check collation propagates up in suitable cases:
select pg_collation_for(percentile_disc(1) within group (order by x collate "POSIX"))
  from (values ('fred'),('jim')) v(x);

-- ordered-set aggs created with CREATE AGGREGATE
select test_rank(3) within group (order by x)
from (values (1),(1),(2),(2),(3),(3),(4)) v(x);
select test_percentile_disc(0.5) within group (order by thousand) from tenk1;

-- ordered-set aggs can't use ungrouped vars in direct args:
select rank(x) within group (order by x) from generate_series(1,5) x;

-- outer-level agg can't use a grouped arg of a lower level, either:
select array(select percentile_disc(a) within group (order by x)
               from (values (0.3),(0.7)) v(a) group by a)
  from generate_series(1,5) g(x);

-- agg in the direct args is a grouping violation, too:
select rank(sum(x)) within group (order by x) from generate_series(1,5) x;

-- hypothetical-set type unification and argument-count failures:
select rank(3) within group (order by x) from (values ('fred'),('jim')) v(x);
select rank(3) within group (order by stringu1,stringu2) from tenk1;
select rank('fred') within group (order by x) from generate_series(1,5) x;
select rank('adam'::text collate "C") within group (order by x collate "POSIX")
  from (values ('fred'),('jim')) v(x);
-- hypothetical-set type unification successes:
select rank('adam'::varchar) within group (order by x) from (values ('fred'),('jim')) v(x);
select rank('3') within group (order by x) from generate_series(1,5) x;

-- divide by zero check
select percent_rank(0) within group (order by x) from generate_series(1,0) x;

-- deparse and multiple features:
create view aggordview1 as
select ten,
       percentile_disc(0.5) within group (order by thousand) as p50,
       percentile_disc(0.5) within group (order by thousand) filter (where hundred=1) as px,
       rank(5,'AZZZZ',50) within group (order by hundred, string4 desc, hundred)
  from tenk1
 group by ten order by ten;

select pg_get_viewdef('aggordview1');
select * from aggordview1 order by ten;
drop view aggordview1;

-- variadic aggregates
select least_agg(q1,q2) from int8_tbl;
select least_agg(variadic array[q1,q2]) from int8_tbl;


-- test aggregates with common transition functions share the same states
begin work;

create type avg_state as (total bigint, count bigint);

create or replace function avg_transfn(state avg_state, n int) returns avg_state as
$$
declare new_state avg_state;
begin
	raise notice 'avg_transfn called with %', n;
	if state is null then
		if n is not null then
			new_state.total := n;
			new_state.count := 1;
			return new_state;
		end if;
		return null;
	elsif n is not null then
		state.total := state.total + n;
		state.count := state.count + 1;
		return state;
	end if;

	return null;
end
$$ language plpgsql;

create function avg_finalfn(state avg_state) returns int4 as
$$
begin
	if state is null then
		return NULL;
	else
		return state.total / state.count;
	end if;
end
$$ language plpgsql;

create function sum_finalfn(state avg_state) returns int4 as
$$
begin
	if state is null then
		return NULL;
	else
		return state.total;
	end if;
end
$$ language plpgsql;

create aggregate my_avg(int4)
(
   stype = avg_state,
   sfunc = avg_transfn,
   finalfunc = avg_finalfn
);

create aggregate my_sum(int4)
(
   stype = avg_state,
   sfunc = avg_transfn,
   finalfunc = sum_finalfn
);

-- aggregate state should be shared as aggs are the same.
select my_avg(one),my_avg(one) from (values(1),(3)) t(one);

-- aggregate state should be shared as transfn is the same for both aggs.
select my_avg(one),my_sum(one) from (values(1),(3)) t(one);

-- shouldn't share states due to the distinctness not matching.
select my_avg(distinct one),my_sum(one) from (values(1),(3)) t(one);

-- shouldn't share states due to the filter clause not matching.
select my_avg(one) filter (where one > 1),my_sum(one) from (values(1),(3)) t(one);

-- this should not share the state due to different input columns.
select my_avg(one),my_sum(two) from (values(1,2),(3,4)) t(one,two);

-- test that aggs with the same sfunc and initcond share the same agg state
create aggregate my_sum_init(int4)
(
   stype = avg_state,
   sfunc = avg_transfn,
   finalfunc = sum_finalfn,
   initcond = '(10,0)'
);

create aggregate my_avg_init(int4)
(
   stype = avg_state,
   sfunc = avg_transfn,
   finalfunc = avg_finalfn,
   initcond = '(10,0)'
);

create aggregate my_avg_init2(int4)
(
   stype = avg_state,
   sfunc = avg_transfn,
   finalfunc = avg_finalfn,
   initcond = '(4,0)'
);

-- state should be shared if INITCONDs are matching
select my_sum_init(one),my_avg_init(one) from (values(1),(3)) t(one);

-- Varying INITCONDs should cause the states not to be shared.
select my_sum_init(one),my_avg_init2(one) from (values(1),(3)) t(one);

rollback;

-- test aggregate state sharing to ensure it works if one aggregate has a
-- finalfn and the other one has none.
begin work;

create or replace function sum_transfn(state int4, n int4) returns int4 as
$$
declare new_state int4;
begin
	raise notice 'sum_transfn called with %', n;
	if state is null then
		if n is not null then
			new_state := n;
			return new_state;
		end if;
		return null;
	elsif n is not null then
		state := state + n;
		return state;
	end if;

	return null;
end
$$ language plpgsql;

create function halfsum_finalfn(state int4) returns int4 as
$$
begin
	if state is null then
		return NULL;
	else
		return state / 2;
	end if;
end
$$ language plpgsql;

create aggregate my_sum(int4)
(
   stype = int4,
   sfunc = sum_transfn
);

create aggregate my_half_sum(int4)
(
   stype = int4,
   sfunc = sum_transfn,
   finalfunc = halfsum_finalfn
);

-- Agg state should be shared even though my_sum has no finalfn
select my_sum(one),my_half_sum(one) from (values(1),(2),(3),(4)) t(one);

rollback;