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1ed6b89563
This feature has been a thorn in our sides for a long time, causing many grammatical ambiguity problems. It doesn't seem worth the pain to continue to support it, so remove it. There are some follow-on improvements we can make in the grammar, but this commit only removes the bare minimum number of productions, plus assorted backend support code. Note that pg_dump and psql continue to have full support, since they may be used against older servers. However, pg_dump warns about postfix operators. There is also a check in pg_upgrade. Documentation-wise, I (tgl) largely removed the "left unary" terminology in favor of saying "prefix operator", which is a more standard and IMO less confusing term. I included a catversion bump, although no initial catalog data changes here, to mark the boundary at which oprkind = 'r' stopped being valid in pg_operator. Mark Dilger, based on work by myself and Robert Haas; review by John Naylor Discussion: https://postgr.es/m/38ca86db-42ab-9b48-2902-337a0d6b8311@2ndquadrant.com
147 lines
3.5 KiB
Plaintext
147 lines
3.5 KiB
Plaintext
<!--
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doc/src/sgml/ref/drop_operator.sgml
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PostgreSQL documentation
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-->
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<refentry id="sql-dropoperator">
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<indexterm zone="sql-dropoperator">
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<primary>DROP OPERATOR</primary>
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</indexterm>
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<refmeta>
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<refentrytitle>DROP OPERATOR</refentrytitle>
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<manvolnum>7</manvolnum>
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<refmiscinfo>SQL - Language Statements</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>DROP OPERATOR</refname>
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<refpurpose>remove an operator</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<synopsis>
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DROP OPERATOR [ IF EXISTS ] <replaceable class="parameter">name</replaceable> ( { <replaceable class="parameter">left_type</replaceable> | NONE } , <replaceable class="parameter">right_type</replaceable> ) [, ...] [ CASCADE | RESTRICT ]
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</synopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>
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<command>DROP OPERATOR</command> drops an existing operator from
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the database system. To execute this command you must be the owner
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of the operator.
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</para>
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</refsect1>
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<refsect1>
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<title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><literal>IF EXISTS</literal></term>
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<listitem>
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<para>
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Do not throw an error if the operator does not exist. A notice is issued
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in this case.
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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">name</replaceable></term>
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<listitem>
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<para>
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The name (optionally schema-qualified) of an existing operator.
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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">left_type</replaceable></term>
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<listitem>
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<para>
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The data type of the operator's left operand; write
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<literal>NONE</literal> if the operator has no left operand.
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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">right_type</replaceable></term>
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<listitem>
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<para>
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The data type of the operator's right operand.
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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><literal>CASCADE</literal></term>
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<listitem>
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<para>
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Automatically drop objects that depend on the operator (such as views
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using it), and in turn all objects that depend on those objects
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(see <xref linkend="ddl-depend"/>).
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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><literal>RESTRICT</literal></term>
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<listitem>
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<para>
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Refuse to drop the operator if any objects depend on it. This
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is the default.
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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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<refsect1>
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<title>Examples</title>
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<para>
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Remove the power operator <literal>a^b</literal> for type <type>integer</type>:
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<programlisting>
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DROP OPERATOR ^ (integer, integer);
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</programlisting>
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</para>
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<para>
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Remove the bitwise-complement prefix operator
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<literal>~b</literal> for type <type>bit</type>:
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<programlisting>
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DROP OPERATOR ~ (none, bit);
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</programlisting>
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</para>
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<para>
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Remove multiple operators in one command:
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<programlisting>
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DROP OPERATOR ~ (none, bit), ^ (integer, integer);
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</programlisting></para>
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</refsect1>
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<refsect1>
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<title>Compatibility</title>
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<para>
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There is no <command>DROP OPERATOR</command> statement in the SQL standard.
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</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<simplelist type="inline">
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<member><xref linkend="sql-createoperator"/></member>
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<member><xref linkend="sql-alteroperator"/></member>
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</simplelist>
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</refsect1>
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</refentry>
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