Accidental use of the PVC_RECURSE_WINDOWFUNCS flag?

I think that the PVC_RECURSE_WINDOWFUNCS flag shouldn't be used in
make_partial_grouping_target().

First, this function uses the grouping_target (see grouping_planner()) as the
input, and that should only contain the input expressions of window functions
as opposed to the window functions themselves. (make_window_input_target() is
responsible for pulling the input expressions from the window functions.)

Second, if a window function appeared in the result of
make_partial_grouping_target() for any reason, the Agg node would fail to
evaluate it. Am I wrong?

-- 
Antonin Houska
Web: https://www.cybertec-postgresql.com