feat(pg): makeProcField can be used to construct aggregates #714
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Description
Rather than rewriting all the computed column logic in @graphile/pg-aggregates it made sense to try and reuse the code we already have. In the end this boiled down to giving a way to tweak the return type of the field and the generated SQL; and exposing
getComputedColumnDetails.Performance impact
Negligible.
Security impact
None known.