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We had an Assert() preventing whole-row expressions from being used in the SET clause of INSERT ON CONFLICT, but it seems unnecessary, given some tests, so remove it. Add a new test to exercise the case. Still at ExecInitPartitionInfo, we used map_partition_varattnos (which constructs an attribute map, then calls map_variable_attnos) using the same two relations many times in different expressions and with different parameters. Constructing the map over and over is a waste. To avoid this repeated work, construct the map once, and use map_variable_attnos() directly instead. Author: Amit Langote, per comments by me (Álvaro) Discussion: https://postgr.es/m/20180326142016.m4st5e34chrzrknk@alvherre.pgsql