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>
Mon, 3 May 2010 04:29:21 +0000 (21:29 -0700)
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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