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array_median.sql
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/*
array_min function setup. and some benchmark.
array_median.sql
*/
begin;
drop function if exists array_median(int2[]);
drop function if exists array_median(int4[]);
drop function if exists array_median(int8[]);
drop function if exists array_median(numeric[]);
drop function if exists array_median(date[]);
drop function if exists array_median(interval[]);
drop function if exists array_median(timestamp[]);
drop function if exists array_median(timestamptz[]);
CREATE OR REPLACE FUNCTION array_median(int2[])
RETURNS int2 SET search_path from current
AS '/home/jian/Desktop/regress_pgsql/array_median', 'array_median'
LANGUAGE c IMMUTABLE STRICT;
CREATE OR REPLACE FUNCTION array_median(int4[])
RETURNS int4 SET search_path from current
AS '/home/jian/Desktop/regress_pgsql/array_median', 'array_median'
LANGUAGE c IMMUTABLE STRICT;
CREATE OR REPLACE FUNCTION array_median(int8[])
RETURNS int8 SET search_path from current
AS '/home/jian/Desktop/regress_pgsql/array_median', 'array_median'
LANGUAGE c IMMUTABLE STRICT;
CREATE OR REPLACE FUNCTION array_median(numeric[])
RETURNS numeric SET search_path from current
AS '/home/jian/Desktop/regress_pgsql/array_median', 'array_median'
LANGUAGE c IMMUTABLE STRICT;
CREATE OR REPLACE FUNCTION array_median(date[])
RETURNS date SET search_path from current
AS '/home/jian/Desktop/regress_pgsql/array_median', 'array_median'
LANGUAGE c IMMUTABLE STRICT;
CREATE OR REPLACE FUNCTION array_median(timestamp[])
RETURNS timestamp SET search_path from current
AS '/home/jian/Desktop/regress_pgsql/array_median', 'array_median'
LANGUAGE c IMMUTABLE STRICT;
CREATE OR REPLACE FUNCTION array_median(timestamptz[])
RETURNS timestamptz SET search_path from current
AS '/home/jian/Desktop/regress_pgsql/array_median', 'array_median'
LANGUAGE c IMMUTABLE STRICT;
CREATE OR REPLACE FUNCTION array_median(interval[])
RETURNS interval SET search_path from current
AS '/home/jian/Desktop/regress_pgsql/array_median', 'array_median'
LANGUAGE c IMMUTABLE STRICT;
commit;
select array_median('{1,11,13,13}'::numeric[]);
select array_median('{1,11,13,13}'::numeric[])
,array_median('{1,11,13,13}'::int2[])
,array_median('{1,11,13,13}'::int4[])
,array_median('{1,11,13,13}'::int8[]);
select array_median('{1,11,12,23,33}'::int2[])
,array_median('{1,11,12,23,33}'::int4[])
,array_median('{1,11,12,23,33}'::int8[])
,array_median('{1,11,12,23,23}'::numeric[]);
select array_median('{1,2,3,4,5,null,null}'::int8[]) as int8min
,array_median('{1,2,3,4,5,null,null}'::int4[]) as int4min
,array_median('{1,2,3,4,5,null,null}'::int2[]) as in2min
,array_median('{1,2,3,4,5,null,null}'::numeric[]) as numericmin
,array_median('{1s,2s,3s,4s,5s,null,null}'::interval[]) as intevalmin
,array_median('{0s,1s,2s,3s,4s,5s,null,null}'::interval[]) as intevalmin;
select array_median('{null,NULL,NULL}'::int2[])
,array_median('{null,NULL,NULL}'::int4[])
,array_median('{null,NULL,NULL}'::int8[])
,array_median('{null,NULL,NULL}'::numeric[]);
-- select array_median(null::int8[]),array_median(null::numeric[]),array_median(null::int4[]),array_median(null::int2[]);
select array_median('{}'::int8[]);
select array_median('{}'::numeric[]);
select array_median('{}'::int4[]);
select array_median('{}'::int2[]);
------------------------------------------------------
select percentile_disc(0.5) WITHIN GROUP (ORDER BY a)
from test_generic
except all
select array_median(a) from test_generic_array;
(select
percentile_disc(0.5) WITHIN GROUP (ORDER BY a)
,percentile_disc(0.5) WITHIN GROUP (ORDER BY b)
,percentile_disc(0.5) WITHIN GROUP (ORDER BY c)
,percentile_disc(0.5) WITHIN GROUP (ORDER BY f)
,percentile_disc(0.5) WITHIN GROUP (ORDER BY g)
,percentile_disc(0.5) WITHIN GROUP (ORDER BY i)
,percentile_disc(0.5) WITHIN GROUP (ORDER BY k)
from test_generic
)
except all
(
select array_median(a)
,array_median(b)
,array_median(c)
,array_median(f)
,array_median(g)
,array_median(i)
,array_median(k)
from test_generic_array
)
--validate
(select
percentile_disc(0.5) WITHIN GROUP (ORDER BY a)
,percentile_disc(0.5) WITHIN GROUP (ORDER BY b)
,percentile_disc(0.5) WITHIN GROUP (ORDER BY c)
,percentile_disc(0.5) WITHIN GROUP (ORDER BY f)
,percentile_disc(0.5) WITHIN GROUP (ORDER BY g)
,percentile_disc(0.5) WITHIN GROUP (ORDER BY i)
,percentile_disc(0.5) WITHIN GROUP (ORDER BY k)
from test_generic_big
)
except all
(
select array_median(a)
,array_median(b)
,array_median(c)
,array_median(f)
,array_median(g)
,array_median(i)
,array_median(k)
from test_generic_big_array
);
explain(costs off, analyze, timing off, buffers)
select percentile_disc(0.5) WITHIN GROUP (ORDER BY a)
from test_generic_big;
explain(costs off, analyze, timing off, buffers)
select array_median(a)
from (select array_agg(a) from test_generic_big s) s(a);
explain(costs off, analyze, timing off, buffers)
select percentile_disc(0.5) WITHIN GROUP (ORDER BY k)
from test_generic_big;
/*
QUERY PLAN
-------------------------------------------------------------------
Aggregate (actual rows=1 loops=1)
Buffers: shared hit=192 read=17050, temp read=3826 written=4911
-> Seq Scan on test_generic_big (actual rows=1000000 loops=1)
Buffers: shared hit=192 read=17050
Planning Time: 0.210 ms
Execution Time: 6428.542 ms
(6 rows)
*/
explain(costs off, analyze, timing off, buffers)
select array_median(k)
from (select array_agg(a) from test_generic_big s) s(k);
/*
QUERY PLAN
----------------------------------------------------------------------------
Subquery Scan on s (actual rows=1 loops=1)
Buffers: shared hit=224 read=17018
-> Aggregate (actual rows=1 loops=1)
Buffers: shared hit=224 read=17018
-> Seq Scan on test_generic_big s_1 (actual rows=1000000 loops=1)
Buffers: shared hit=224 read=17018
Planning Time: 0.345 ms
Execution Time: 1532.397 ms
(8 rows)
*/