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1 parent 98be2b5 commit d5ce393Copy full SHA for d5ce393
doc/src/sgml/func.sgml
@@ -9136,6 +9136,16 @@ SELECT a,
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SELECT ... WHERE CASE WHEN x <> 0 THEN y/x > 1.5 ELSE false END;
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</programlisting>
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</para>
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+
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+ <note>
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+ <para>
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+ As described in <xref linkend="xfunc-volatility">, functions and
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+ operators marked <literal>IMMUTABLE</literal> can be evaluated when
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+ the query is planned rather than when it is executed. This means
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+ that constant parts of a subexpression that is not evaluated during
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+ query execution might still be evaluated during query planning.
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+ </para>
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+ </note>
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</sect2>
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<sect2>
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