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