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