BUG #3641: Concat fails in update

The following bug has been logged online:

Bug reference:      3641
Logged by:          Curt
Email address:      kurt@net2business.com
PostgreSQL version: 8.1.9-1.el5
Operating system:   Centos 5
Description:        Concat fails in update
Details:

UPDATE table content=content || 'constant' where idx=101;

Content field is overwritten with 'constant'.