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doc: Add index entry for "hypothetical-set aggregate"
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@ -12904,6 +12904,11 @@ SELECT xmlagg(x) FROM (SELECT x FROM test ORDER BY y DESC) AS tab;
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simply produces a null result.
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</para>
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<indexterm>
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<primary>hypothetical-set aggregate</primary>
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<secondary>built-in</secondary>
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</indexterm>
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<para>
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Each of the aggregates listed in
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<xref linkend="functions-hypothetical-table"> is associated with a
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