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https://github.com/postgres/postgres.git
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Tom Lane
bec98a31c5
There's now only one transition value and transition function. NULL handling in aggregates is a lot cleaner. Also, use Numeric accumulators instead of integer accumulators for sum/avg on integer datatypes --- this avoids overflow at the cost of being a little slower. Implement VARIANCE() and STDDEV() aggregates in the standard backend. Also, enable new LIKE selectivity estimators by default. Unrelated change, but as long as I had to force initdb anyway...
24 lines
496 B
SQL
24 lines
496 B
SQL
--
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-- CREATE_AGGREGATE
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--
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-- all functions CREATEd
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CREATE AGGREGATE newavg (
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sfunc = int4_accum, basetype = int4, stype = _numeric,
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finalfunc = numeric_avg,
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initcond1 = '{0,0,0}'
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);
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-- without finalfunc; test obsolete spellings 'sfunc1' etc
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CREATE AGGREGATE newsum (
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sfunc1 = int4pl, basetype = int4, stype1 = int4,
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initcond1 = '0'
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);
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-- value-independent transition function
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CREATE AGGREGATE newcnt (
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sfunc = int4inc, basetype = 'any', stype = int4,
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initcond = '0'
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);
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