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Commit51aebcd

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Doc: in back branches, don't call it a row constructor if it isn't really.
Before commit906bfca, we were not actually processing the righthandside of a multiple-column assignment in UPDATE as a row constructor:it was just a parenthesized list of expressions. Call it that ratherthan risking confusion by people who would expect the documented behaviorsof row constructors to apply.Back-patch to 9.5; before that, the text correctly described the constructas a "list of independent expressions".Discussion: <16288.1479610770@sss.pgh.pa.us>
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‎doc/src/sgml/ref/update.sgml

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@@ -422,9 +422,9 @@ UPDATE films SET kind = 'Dramatic' WHERE CURRENT OF c_films;
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According to the standard, the source value for a parenthesized sub-list of
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column names can be any row-valued expression yielding the correct number
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of columns. <productname>PostgreSQL</productname> only allows the source
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value to be a parenthesized list of expressions(a row constructor)or a
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value to be a parenthesized list of expressions or a
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sub-<literal>SELECT</>. An individual column's updated value can be
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specified as <literal>DEFAULT</> in therow-constructor case, but not
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specified as <literal>DEFAULT</> in thelist-of-expressions case, but not
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inside a sub-<literal>SELECT</>.
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</para>
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</refsect1>

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