On Thu, Aug 2, 2012 at 4:52 PM, Ayyappa Chaturvedula
<ayyappach at gmail.com> wrote:
Michael, Thank you for this , it worked. I was thinking "by" is a required argument in merge function.
Well, it is "required" in a strict sense, but it has a default value (defaulting to the shared names) so _you_ don't have to specify it. Best, Michael
Regards, Ayyappa