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Support "variadic" functions, which can accept a variable number of arguments

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so long as all the trailing arguments are of the same (non-array) type.
The function receives them as a single array argument (which is why they
have to all be the same type).

It might be useful to extend this facility to aggregates, but this patch
doesn't do that.

This patch imposes a noticeable slowdown on function lookup --- a follow-on
patch will fix that by adding a redundant column to pg_proc.

Pavel Stehule
This commit is contained in:
Tom Lane
2008-07-16 01:30:23 +00:00
parent 2c773296f8
commit d89737d31c
38 changed files with 915 additions and 170 deletions
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11
doc/src/sgml/ref/alter_function.sgml
View File

@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/alter_function.sgml,v 1.15 2007/09/03 18:46:29 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/alter_function.sgml,v 1.16 2008/07/16 01:30:21 tgl Exp $
PostgreSQL documentation
-->
@ -81,13 +81,14 @@ where <replaceable class="PARAMETER">action</replaceable> is one of:
<listitem>
<para>
The mode of an argument: either <literal>IN</>, <literal>OUT</>,
or <literal>INOUT</>. If omitted, the default is <literal>IN</>.
The mode of an argument: <literal>IN</>, <literal>OUT</>,
<literal>INOUT</>, or <literal>VARIADIC</>.
If omitted, the default is <literal>IN</>.
Note that <command>ALTER FUNCTION</command> does not actually pay
any attention to <literal>OUT</> arguments, since only the input
arguments are needed to determine the function's identity.
So it is sufficient to list the <literal>IN</> and <literal>INOUT</>
arguments.
So it is sufficient to list the <literal>IN</>, <literal>INOUT</>,
and <literal>VARIADIC</> arguments.
</para>
</listitem>
</varlistentry>