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The original code was unable to prune partitions that could not possibly contain NULL values, when the query specified less than all columns in a multicolumn partition key. Reorder the if-tests so that it is, and add more commentary and regression tests. Reported-by: Ashutosh Bapat <ashutosh.bapat@enterprisedb.com> Co-authored-by: Dilip Kumar <dilipbalaut@gmail.com> Co-authored-by: Amit Langote <Langote_Amit_f8@lab.ntt.co.jp> Co-authored-by: Álvaro Herrera <alvherre@alvh.no-ip.org> Reviewed-by: Ashutosh Bapat <ashutosh.bapat@enterprisedb.com> Reviewed-by: amul sul <sulamul@gmail.com> Discussion: https://postgr.es/m/CAFjFpRc7qjLUfXLVBBC_HAnx644sjTYM=qVoT3TJ840HPbsTXw@mail.gmail.com