Add quote_literal(anyelement) to preserve (and, in fact, extend) a

useful consequence of the former liberal implicit casting to text;
namely that you can feed non-string values to quote_literal() and get
unsurprising results.  Per discussion.

doc/src/sgml/func.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.411 2007/11/08 13:13:28 petere Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.412 2007/11/27 18:29:11 tgl Exp $ -->
 
  <chapter id="functions">
   <title>Functions and Operators</title>
@@ -1514,7 +1514,7 @@
       </row>
 
       <row>
-       <entry><literal><function>quote_ident</function>(<parameter>string</parameter>)</literal></entry>
+       <entry><literal><function>quote_ident</function>(<parameter>string</parameter> <type>text</type>)</literal></entry>
        <entry><type>text</type></entry>
        <entry>
         Return the given string suitably quoted to be used as an identifier
@@ -1528,7 +1528,7 @@
       </row>
 
       <row>
-       <entry><literal><function>quote_literal</function>(<parameter>string</parameter>)</literal></entry>
+       <entry><literal><function>quote_literal</function>(<parameter>string</parameter> <type>text</type>)</literal></entry>
        <entry><type>text</type></entry>
        <entry>
         Return the given string suitably quoted to be used as a string literal
@@ -1539,6 +1539,17 @@
        <entry><literal>'O''Reilly'</literal></entry>
       </row>
 
+      <row>
+       <entry><literal><function>quote_literal</function>(<parameter>value</parameter> <type>anyelement</type>)</literal></entry>
+       <entry><type>text</type></entry>
+       <entry>
+        Coerce the given value to text and then quote it as a literal.
+        Embedded single-quotes and backslashes are properly doubled.
+       </entry>
+       <entry><literal>quote_literal(42.5)</literal></entry>
+       <entry><literal>'42.5'</literal></entry>
+      </row>
+
       <row>
        <entry><literal><function>regexp_matches</function>(<parameter>string</parameter> <type>text</type>, <parameter>pattern</parameter> <type>text</type> [, <parameter>flags</parameter> <type>text</type>])</literal></entry>
        <entry><type>setof text[]</type></entry>

src/include/catalog/catversion.h

@@ -37,7 +37,7 @@
  * Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.438 2007/11/27 12:21:05 petere Exp $
+ * $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.439 2007/11/27 18:29:11 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -53,6 +53,6 @@
  */
 
 /*							yyyymmddN */
-#define CATALOG_VERSION_NO	200711271
+#define CATALOG_VERSION_NO	200711272
 
 #endif

src/include/catalog/pg_proc.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/catalog/pg_proc.h,v 1.479 2007/11/27 12:21:05 petere Exp $
+ * $PostgreSQL: pgsql/src/include/catalog/pg_proc.h,v 1.480 2007/11/27 18:29:11 tgl Exp $
  *
  * NOTES
  *	  The script catalog/genbki.sh reads this file and generates .bki
@@ -2631,6 +2631,8 @@ DATA(insert OID =  1282 ( quote_ident	   PGNSP PGUID 12 1 0 f f t f i 1 25 "25"
 DESCR("quote an identifier for usage in a querystring");
 DATA(insert OID =  1283 ( quote_literal    PGNSP PGUID 12 1 0 f f t f i 1 25 "25" _null_ _null_ _null_ quote_literal - _null_ _null_ ));
 DESCR("quote a literal for usage in a querystring");
+DATA(insert OID =  1285 ( quote_literal    PGNSP PGUID 14 1 0 f f t f v 1 25 "2283" _null_ _null_ _null_ "select pg_catalog.quote_literal($1::pg_catalog.text)" - _null_ _null_ ));
+DESCR("quote a data value for usage in a querystring");
 
 DATA(insert OID = 1798 (  oidin			   PGNSP PGUID 12 1 0 f f t f i 1 26 "2275" _null_ _null_ _null_ oidin - _null_ _null_ ));
 DESCR("I/O");