BUG #6727: Column does not exist exception has no error code

The following bug has been logged on the website:

Bug reference:      6727
Logged by:          Patrick Tucker
Email address:      tuckerpmt@gmail.com
PostgreSQL version: 9.1.1
Operating system:   Windows
Description:=20=20=20=20=20=20=20=20

The SQLException that is thrown when performing a query that has a column
name that is not valid, does not exist, does not contain an error code.  We
are forced to do a string comparison to figure out if a particular exception
is caused by an invalid column name.  This is not ideal.  A fix would be
greatly appreciated.

Thanks,
Pat