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Commit5e74a42

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Document incompatibility of comparison expressions with VARIADIC array arguments
COALESCE, GREATEST and LEAST all look like functions taking variablenumbers of arguments, but in fact they are not functions, and soVARIADIC array arguments don't work with them. Add a note to the docsexplaining this fact.The consensus is not to try to make this work, but just to document thelimitation.Discussion:https://postgr.es/m/CAFj8pRCaAtuXuRtvXf5GmPbAVriUQrNMo7-=TXUFN025S31R_w@mail.gmail.com
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‎doc/src/sgml/func.sgml

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@@ -12481,6 +12481,15 @@ SELECT setval('foo', 42, false); <lineannotation>Next <function>nextval</func
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</para>
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</tip>
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<note>
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<para>
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Although <token>COALESCE</token>, <token>GREATEST</token>, and
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<token>LEAST</token> are syntactically similar to functions, they are
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not strictly functions, and thus cannot be used with explicit
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<token>VARIADIC</token> array arguments.
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</para>
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</note>
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<sect2 id="functions-case">
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<title><literal>CASE</literal></title>
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