Mark factorial operator, and postfix operators in general, as deprecated.

Back-patch key parts of 4c5cf5431 and 6ca547cf7 into stable branches.
I didn't touch pg_description entries here, so it's purely a docs
change; and I didn't fool with any examples either.  The main point
is so that anyone who's wondering if factorial() exists in the stable
branches will be reassured.

Mark Dilger and John Naylor, with some adjustments by me

Discussion: https://postgr.es/m/BE2DF53D-251A-4E26-972F-930E523580E9@enterprisedb.com

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 094b0df7fc43c945338eb6f10da5560caaf5aac7..9d34bc0282c34fda12049f31db4989b312fafe40 100644 (file)
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -524,14 +524,16 @@
 
       <row>
        <entry> <literal>!</literal> </entry>
-       <entry>factorial</entry>
+       <entry>factorial
+        (deprecated, use <function>factorial()</function> instead)</entry>
        <entry><literal>5 !</literal></entry>
        <entry><literal>120</literal></entry>
       </row>
 
       <row>
        <entry> <literal>!!</literal> </entry>
-       <entry>factorial (prefix operator)</entry>
+       <entry>factorial as a prefix operator
+        (deprecated, use <function>factorial()</function> instead)</entry>
        <entry><literal>!! 5</literal></entry>
        <entry><literal>120</literal></entry>
       </row>
@@ -714,6 +716,19 @@
        <entry><literal>2.71828182845905</literal></entry>
       </row>
 
+      <row>
+       <entry>
+        <indexterm>
+         <primary>factorial</primary>
+        </indexterm>
+        <literal><function>factorial(<type>bigint</type>)</function></literal>
+       </entry>
+       <entry><type>numeric</type></entry>
+       <entry>factorial</entry>
+       <entry><literal>factorial(5)</literal></entry>
+       <entry><literal>120</literal></entry>
+      </row>
+
       <row>
        <entry>
         <indexterm>

diff --git a/doc/src/sgml/ref/create_operator.sgml b/doc/src/sgml/ref/create_operator.sgml
index 818e3a2315a569227933d48bde8358042d10b5cf..73ccac7fecf6f8245423b23227073aadbff5dee3 100644 (file)
--- a/doc/src/sgml/ref/create_operator.sgml
+++ b/doc/src/sgml/ref/create_operator.sgml
@@ -87,11 +87,18 @@ CREATE OPERATOR <replaceable>name</replaceable> (
 
   <para>
    At least one of <literal>LEFTARG</> and <literal>RIGHTARG</> must be defined.  For
-   binary operators, both must be defined. For right  unary
+   binary operators, both must be defined. For right unary
    operators, only <literal>LEFTARG</> should be defined, while for left
    unary operators only <literal>RIGHTARG</> should be defined.
   </para>
 
+  <note>
+   <para>
+    Right unary, also called postfix, operators are deprecated and will be
+    removed in <productname>PostgreSQL</productname> version 14.
+   </para>
+  </note>
+
   <para>
    The <replaceable class="parameter">function_name</replaceable>
    procedure must have been previously defined using <command>CREATE