sort: Add support for combining cases with identical sort criteria.
authorBen Pfaff <blp@cs.stanford.edu>
Sun, 21 Mar 2010 19:40:41 +0000 (12:40 -0700)
committerBen Pfaff <blp@cs.stanford.edu>
Sat, 29 Nov 2014 20:44:55 +0000 (12:44 -0800)
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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