From dc41fd886976f2246d81da0788eaf9dd0a887f06 Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Mon, 3 Mar 2008 17:11:13 +0000
Subject: [PATCH] Document that chr(0) is not supported, and why.
---
doc/src/sgml/func.sgml | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index b362d8ac034..72f8af603a2 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 1.420 2008/02/26 15:32:30 petere Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.421 2008/03/03 17:11:13 momjian Exp $ -->
<chapter id="functions">
<title>Functions and Operators</title>
@@ -1340,7 +1340,8 @@
Character with the given code. For <acronym>UTF8</acronym> the
argument is treated as a Unicode code point. For other multibyte
encodings the argument must designate a strictly
- <acronym>ASCII</acronym> character.
+ <acronym>ASCII</acronym> character. The NULL (0) character is not
+ allowed because text data types cannot reliably store such bytes.
</entry>
<entry><literal>chr(65)</literal></entry>
<entry><literal>A</literal></entry>
--
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