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Document incompatibility of comparison expressions with VARIADIC array arguments

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COALESCE, GREATEST and LEAST all look like functions taking variable
numbers of arguments, but in fact they are not functions, and so
VARIADIC array arguments don't work with them. Add a note to the docs
explaining this fact.

The consensus is not to try to make this work, but just to document the
limitation.

Discussion: https://postgr.es/m/CAFj8pRCaAtuXuRtvXf5GmPbAVriUQrNMo7-=TXUFN025S31R_w@mail.gmail.com
This commit is contained in:
Andrew Dunstan 2019-03-11 18:14:05 -04:00
parent 32b8f0b033
commit 5e74a42785
1 changed files with 9 additions and 0 deletions
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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
</para>
</tip>
<note>
<para>
Although <token>COALESCE</token>, <token>GREATEST</token>, and
<token>LEAST</token> are syntactically similar to functions, they are
not strictly functions, and thus cannot be used with explicit
<token>VARIADIC</token> array arguments.
</para>
</note>
<sect2 id="functions-case">
<title><literal>CASE</literal></title>