I can't help but wonder if maybe the problem you're trying to solve
could be done in a different way (like, when your RFiles are
generated). What kinds of things are your trying to do with the
enumeration of columns? Because, if you're trying to do something like
show these in a drop-down box in a web interface or something, these
could potentially be quite exhaustive... too big for even one machine
to handle, in the general case. Except in very specific use cases, I
can't imagine enumerating every column would be very useful. Perhaps
yours is such a use case, but I wonder...

Christopher L Tubbs II
On Sat, Feb 22, 2014 at 3:32 PM, Arshak Navruzyan <[EMAIL PROTECTED]> wrote:

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