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Update documentation to reflect the fact that ORDER BY, GROUP BY, etc

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are now driven by the default btree opclass, rather than assuming that
particular operator names have the needed semantics.
This commit is contained in:
Tom Lane
2003-08-17 22:09:00 +00:00
parent 1b68704482
commit 4215947986
4 changed files with 82 additions and 32 deletions
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12
doc/src/sgml/ref/create_operator.sgml
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@@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_operator.sgml,v 1.35 2003/04/22 10:08:08 petere Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_operator.sgml,v 1.36 2003/08/17 22:09:00 tgl Exp $
PostgreSQL documentation
-->
@@ -43,17 +43,11 @@ CREATE OPERATOR <replaceable>name</replaceable> (
The operator name is a sequence of up to <symbol>NAMEDATALEN</>-1
(63 by default) characters from the following list:
<literallayout>
+ - * / &lt; &gt; = ~ ! @ # % ^ &amp; | ` ? $
+ - * / &lt; &gt; = ~ ! @ # % ^ &amp; | ` ?
</literallayout>
There are a few restrictions on your choice of name:
<itemizedlist>
<listitem>
<para>
<literal>$</literal> cannot be defined as a single-character operator,
although it can be part of a multicharacter operator name.
</para>
</listitem>
<listitem>
<para>
<literal>--</literal> and <literal>/*</literal> cannot appear anywhere in an operator name,
@@ -66,7 +60,7 @@ CREATE OPERATOR <replaceable>name</replaceable> (
<literal>-</literal>,
unless the name also contains at least one of these characters:
<literallayout>
~ ! @ # % ^ &amp; | ` ? $
~ ! @ # % ^ &amp; | ` ?
</literallayout>
For example, <literal>@-</literal> is an allowed operator name,
but <literal>*-</literal> is not.