I wrote:
> Hmm ... prairiedog isn't showing the warning, but maybe gaur will.

Bingo:

parse_agg.c: In function 'expand_grouping_sets':
parse_agg.c:1851:5: warning: value computed is not used

This is gcc 4.5, but hopefully whatever shuts it up will also work on 4.7.
I'll work on figuring that out.

                        regards, tom lane


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