1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
-- 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'
);
|
