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Commit321eed5

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Add ALTER OPERATOR command, for changing selectivity estimator functions.
Other options cannot be changed, as it's not totally clear if cached planswould need to be invalidated if one of the other options change. Selectivityestimator functions only change plan costs, not correctness of plans, sothose should be safe.Original patch by Uriy Zhuravlev, heavily edited by me.
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‎doc/src/sgml/ref/alter_operator.sgml

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@@ -26,6 +26,11 @@ ALTER OPERATOR <replaceable>name</replaceable> ( { <replaceable>left_type</repla
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ALTER OPERATOR <replaceable>name</replaceable> ( { <replaceable>left_type</replaceable> | NONE } , { <replaceable>right_type</replaceable> | NONE } )
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SET SCHEMA <replaceable>new_schema</replaceable>
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ALTER OPERATOR <replaceable>name</replaceable> ( { <replaceable>left_type</replaceable> | NONE } , { <replaceable>right_type</replaceable> | NONE } )
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SET ( { RESTRICT = { <replaceable class="parameter">res_proc</replaceable> | NONE }
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| JOIN = { <replaceable class="parameter">join_proc</replaceable> | NONE }
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} [, ... ] )
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</synopsis>
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</refsynopsisdiv>
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@@ -34,8 +39,7 @@ ALTER OPERATOR <replaceable>name</replaceable> ( { <replaceable>left_type</repla
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<para>
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<command>ALTER OPERATOR</command> changes the definition of
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an operator. The only currently available functionality is to change the
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owner of the operator.
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an operator.
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</para>
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<para>
@@ -98,6 +102,25 @@ ALTER OPERATOR <replaceable>name</replaceable> ( { <replaceable>left_type</repla
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">res_proc</replaceable></term>
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<listitem>
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<para>
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The restriction selectivity estimator function for this operator; write NONE to remove existing selectivity estimator.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">join_proc</replaceable></term>
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<listitem>
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<para>
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The join selectivity estimator function for this operator; write NONE to remove existing selectivity estimator.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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@@ -109,6 +132,13 @@ ALTER OPERATOR <replaceable>name</replaceable> ( { <replaceable>left_type</repla
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<programlisting>
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ALTER OPERATOR @@ (text, text) OWNER TO joe;
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</programlisting></para>
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<para>
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Change the restriction and join selectivity estimator functions of a custom operator <literal>a && b</literal> for type <type>int[]</type>:
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<programlisting>
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ALTER OPERATOR && (_int4, _int4) SET (RESTRICT = _int_contsel, JOIN = _int_contjoinsel);
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</programlisting></para>
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</refsect1>
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<refsect1>

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