From b8fab2411dbb08d918d5998ee78325d2a0549c7f Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Mon, 3 Nov 2008 17:51:13 +0000
Subject: Add pg_typeof() function.

Brendan Jurd
---
 doc/src/sgml/func.sgml | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

(limited to 'doc/src')

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index df6045fc70e..7cfb1219889 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -1,4 +1,4 @@
-<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.451 2008/10/27 09:37:46 petere Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.452 2008/11/03 17:51:12 tgl Exp $ -->
 
  <chapter id="functions">
   <title>Functions and Operators</title>
@@ -11643,6 +11643,10 @@ SELECT pg_type_is_visible('myschema.widget'::regtype);
     <primary>pg_tablespace_databases</primary>
    </indexterm>
 
+   <indexterm>
+    <primary>pg_typeof</primary>
+   </indexterm>
+
   <para>
    <xref linkend="functions-info-catalog-table"> lists functions that
    extract information from the system catalogs.
@@ -11766,6 +11770,11 @@ SELECT pg_type_is_visible('myschema.widget'::regtype);
        <entry><type>setof oid</type></entry>
        <entry>get the set of database OIDs that have objects in the tablespace</entry>
       </row>
+      <row>
+       <entry><literal><function>pg_typeof</function>(<parameter>any</parameter>)</literal></entry>
+       <entry><type>regtype</type></entry>
+       <entry>get the data type of any value</entry>
+      </row>
      </tbody>
     </tgroup>
    </table>
@@ -11848,6 +11857,12 @@ SELECT pg_type_is_visible('myschema.widget'::regtype);
    <structname>pg_class</> catalogs.
   </para>
 
+  <para>
+   <function>pg_typeof</function> returns the OID of the data type of the
+   value that is passed to it.  This can be helpful for troubleshooting or
+   dynamically constructing SQL queries.
+  </para>
+
    <indexterm>
     <primary>col_description</primary>
    </indexterm>
-- 
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