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Previously we did a ExecProject() for each individual aggregate argument. That turned out to be a performance bottleneck in queries with multiple aggregates. Doing all the argument computations in one ExecProject() is quite a bit cheaper because ExecProject's fastpath can do the work at once in a relatively tight loop, and because it can get all the required columns with a single slot_getsomeattr and save some other redundant setup costs. Author: Andres Freund Reviewed-By: Heikki Linnakangas Discussion: https://postgr.es/m/20161103110721.h5i5t5saxfk5eeik@alap3.anarazel.de