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Before commit 906bfcad7, we were not actually processing the righthand side of a multiple-column assignment in UPDATE as a row constructor: it was just a parenthesized list of expressions. Call it that rather than risking confusion by people who would expect the documented behaviors of row constructors to apply. Back-patch to 9.5; before that, the text correctly described the construct as a "list of independent expressions". Discussion: <16288.1479610770@sss.pgh.pa.us>