From: Ben Pfaff <blp@cs.stanford.edu>
Date: Sun, 21 Mar 2010 19:40:41 +0000 (-0700)
Subject: sort: Add support for combining cases with identical sort criteria.
X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;ds=sidebyside;h=86189d786fc34c9da174b5018bec27640f7062e4;hp=86189d786fc34c9da174b5018bec27640f7062e4;p=pspp

sort: Add support for combining cases with identical sort criteria.

This makes it possible to efficiently assemble frequency tables and
crosstabs for data sets that might be larger than available memory.
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