2000年7月17日 03:05:41 +0000 (03:05 +0000)
2000年7月17日 03:05:41 +0000 (03:05 +0000)
commit bec98a31c55a4f799b398d01541e68d7c086bb81
Revise aggregate functions per earlier discussions in pghackers.
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...