KaiGai, David Rowley and myself have all made mention of various ways we could optimize aggregates.
Following WIP patch adds an extra function called a "combining function", that is intended to allow the user to specify a semantically correct way of breaking down an aggregate into multiple steps. Gents, is this what you were thinking? If not... -- Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services
aggregate_combining_fn.v1.patch
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