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Remove factorial operators, leaving only the factorial() function.

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The "!" operator is our only built-in postfix operator.  Remove it,
on the way to removal of grammar support for postfix operators.

There is also a "!!" prefix operator, but since it's been marked
deprecated for most of its existence, we might as well remove it too.

Also zap the SQL alias function numeric_fac(), which seems to have
equally little reason to live.

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
This commit is contained in:
Tom Lane
2020-09-17 16:17:27 -04:00
parent 74d4608f50
commit 76f412ab31
10 changed files with 33 additions and 93 deletions
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30
doc/src/sgml/func.sgml
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@ -1048,36 +1048,6 @@ repeat('Pg', 4) <returnvalue>PgPgPgPg</returnvalue>
</para></entry>
</row>
<row>
<entry role="func_table_entry"><para role="func_signature">
<type>bigint</type> <literal>!</literal>
<returnvalue>numeric</returnvalue>
</para>
<para>
Factorial
(deprecated, use <link linkend="function-factorial"><function>factorial()</function></link> instead)
</para>
<para>
<literal>5 !</literal>
<returnvalue>120</returnvalue>
</para></entry>
</row>
<row>
<entry role="func_table_entry"><para role="func_signature">
<literal>!!</literal> <type>bigint</type>
<returnvalue>numeric</returnvalue>
</para>
<para>
Factorial as a prefix operator
(deprecated, use <link linkend="function-factorial"><function>factorial()</function></link> instead)
</para>
<para>
<literal>!! 5</literal>
<returnvalue>120</returnvalue>
</para></entry>
</row>
<row>
<entry role="func_table_entry"><para role="func_signature">
<literal>@</literal> <replaceable>numeric_type</replaceable>