I've been running out of memory when trying to sort search results by
title. This is true even for small result sets (17 hits). We do have
a really large index here (over 4 million documents), but I was able
to sort the same result set by date and by author without a hitch.
Call number sorts also work, but we haven't loaded call numbers from
our holdings yet, so I think the call number field has few distinct
Any idea why author and date sorts would work, but title would not?