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From Chris Hostetter <>
Subject RE: MissingStringLastComparatorSource and MultiSearcher
Date Fri, 14 Jul 2006 23:23:42 GMT

: I was wanting to apply this to a field, which sorts on INT. Specifically I'm
: trying to achieve reverse chronological sorting on a timestamp field, which
: stores YYMMDDHHI (i.e. resolves to 10 minutes and doesn't handle centuries).
: Missing timestamps are assumed to be "old" (i.e. should appear at the end).

for the record, MissingStringLastComparatorSource isn't really needed in
this case.  If a missing timestamp field should be interpreted as "old"
then normal Lucene "reverse" sorting (either String or int) should work
fine for a reverse chronological sort -- because in normal String sorting
"null" is low, and (i'm 99% sure)  in int sorting "null" is assigned a
value of 0.  In both cases, your "old"  docs will wind up where you want

MissingStringLastComparatorSource comes in handy when you want docs
without a timestamp value to appear at the end of your list *regardless*
of wether the user selected "oldest first" or "newest first"


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