Re: range_agg

v17 is a rebase fixing a minor parse_coerce.c edit; v16 lasted little
:-(  I chose to change the wording of the conflicting comment in
enforce_generic_type_consistency():

 * 3) Similarly, if return type is ANYRANGE or ANYMULTIRANGE, and any
 *      argument is ANYRANGE or ANYMULTIRANGE, use that argument's
 *      actual type, range type or multirange type as the function's return
 *      type.

This wording is less precise, in that it doesn't say exactly which of
the three types is the actual result for each of the possible four cases
(r->r, r->m, m->m, m->r) but I think it should be straightforward.

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
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