From 473865048517c7808ddcf2299d054d8fe30fc6d5 Mon Sep 17 00:00:00 2001
From: Andrew Dunstan <andrew@dunslane.net>
Date: Fri, 17 Jul 2015 21:08:03 -0400
Subject: [PATCH] Release note compatibility item
Note that json and jsonb extraction operators no longer consider a
negative subscript to be invalid.
---
doc/src/sgml/release-9.5.sgml | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/doc/src/sgml/release-9.5.sgml b/doc/src/sgml/release-9.5.sgml
index 817b973546a..0b12420aead 100644
--- a/doc/src/sgml/release-9.5.sgml
+++ b/doc/src/sgml/release-9.5.sgml
@@ -162,6 +162,17 @@
</para>
</listitem>
+ <listitem>
+ <para>
+ Allow <type>json</> and <type>jsonb</> extraction operators to
+ accept negative subscripts, which count from the end of JSON
+ arrays. Historically, these operators yielded <literal>NULL</>
+ in the event of a negative subscript, because negative
+ subscripts were considered invalid. (Peter Geoghegan, Andrew
+ Dunstan)
+ </para>
+ </listitem>
+
</itemizedlist>
</sect2>
--
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