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In commit 915b703e1 I gave get_agg_clause_costs() the responsibility of marking Aggref nodes with the appropriate aggtranstype. I failed to notice that where it was being called from, it might see only a subset of the Aggref nodes that were in the original targetlist. Specifically, if there are duplicate aggregate calls in the tlist, either make_sort_input_target or make_window_input_target might put just a single instance into the grouping_target, and then only that instance would get marked. Fix by moving the call back into grouping_planner(), before we start building assorted PathTargets from the query tlist. Per report from Stefan Huehner. Report: <20160702131056.GD3165@huehner.biz>