used for the input type of an aggregate.
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PostgreSQL documentation
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<listitem>
<para>
The input data type on which this aggregate function operates.
- This can be specified as ANY for an aggregate that does not
- examine its input values
+ This can be specified as <literal>"ANY"</> for an aggregate that does
+ not examine its input values
(an example is <function>count(*)</function>).
</para>
</listitem>