mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-07-15 10:41:10 +02:00
89 lines
1.7 KiB
MySQL
89 lines
1.7 KiB
MySQL
|
-- statmath.sql
|
||
|
--
|
||
|
-- Install the statistical aggregates
|
||
|
--
|
||
|
|
||
|
--
|
||
|
-- Create the new data type for the state transition variable
|
||
|
--
|
||
|
CREATE FUNCTION statmath_stateval_in(opaque)
|
||
|
RETURNS statmath_stateval
|
||
|
AS 'MODULE_PATHNAME'
|
||
|
LANGUAGE 'C';
|
||
|
|
||
|
CREATE FUNCTION statmath_stateval_out(opaque)
|
||
|
RETURNS opaque
|
||
|
AS 'MODULE_PATHNAME'
|
||
|
LANGUAGE 'C';
|
||
|
|
||
|
CREATE TYPE statmath_stateval (
|
||
|
internallength = 16,
|
||
|
input = statmath_stateval_in,
|
||
|
output = statmath_stateval_out,
|
||
|
alignment = double
|
||
|
);
|
||
|
|
||
|
--
|
||
|
-- Create the statistic data collector used in the aggregates
|
||
|
--
|
||
|
CREATE FUNCTION statmath_collect(statmath_stateval, float8)
|
||
|
RETURNS statmath_stateval
|
||
|
AS 'MODULE_PATHNAME'
|
||
|
LANGUAGE 'C';
|
||
|
|
||
|
--
|
||
|
-- Create the final functions for the three aggregates
|
||
|
--
|
||
|
CREATE FUNCTION statmath_average_fin(float8, int4)
|
||
|
RETURNS float8
|
||
|
AS 'MODULE_PATHNAME'
|
||
|
LANGUAGE 'C';
|
||
|
|
||
|
CREATE FUNCTION statmath_variance_fin(statmath_stateval, int4)
|
||
|
RETURNS float8
|
||
|
AS 'MODULE_PATHNAME'
|
||
|
LANGUAGE 'C';
|
||
|
|
||
|
CREATE FUNCTION statmath_stddev_fin(statmath_stateval, int4)
|
||
|
RETURNS float8
|
||
|
AS 'MODULE_PATHNAME'
|
||
|
LANGUAGE 'C';
|
||
|
|
||
|
--
|
||
|
-- Create the aggregates themself
|
||
|
--
|
||
|
CREATE AGGREGATE average (
|
||
|
basetype = float8,
|
||
|
stype1 = float8,
|
||
|
stype2 = int4,
|
||
|
sfunc1 = float8pl,
|
||
|
sfunc2 = int4inc,
|
||
|
finalfunc = statmath_average_fin,
|
||
|
initcond1 = '0',
|
||
|
initcond2 = '0'
|
||
|
);
|
||
|
|
||
|
CREATE AGGREGATE variance (
|
||
|
basetype = float8,
|
||
|
stype1 = statmath_stateval,
|
||
|
stype2 = int4,
|
||
|
sfunc1 = statmath_collect,
|
||
|
sfunc2 = int4inc,
|
||
|
finalfunc = statmath_variance_fin,
|
||
|
initcond1 = '0:0',
|
||
|
initcond2 = '0'
|
||
|
);
|
||
|
|
||
|
CREATE AGGREGATE stddev (
|
||
|
basetype = float8,
|
||
|
stype1 = statmath_stateval,
|
||
|
stype2 = int4,
|
||
|
sfunc1 = statmath_collect,
|
||
|
sfunc2 = int4inc,
|
||
|
finalfunc = statmath_stddev_fin,
|
||
|
initcond1 = '0:0',
|
||
|
initcond2 = '0'
|
||
|
);
|
||
|
|
||
|
|