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Posted to solr-user@lucene.apache.org by James liu <li...@gmail.com> on 2006/09/18 14:22:11 UTC
about sortMissingLast and sortMissingFirst
i look expression about them in schema.xml.
but i m not clear.
My
understand: if sortMissingLast is true do last in descending sort. for example:
field name : pname, if sortMissingLast is true, pname will be sorted desc
and we can't find result with pname, only other field information.
am i wrong?
--
regards
jl
Re: about sortMissingLast and sortMissingFirst
Posted by Chris Hostetter <ho...@fucit.org>.
: My
: understand: if sortMissingLast is true do last in descending sort. for example:
: field name : pname, if sortMissingLast is true, pname will be sorted desc
: and we can't find result with pname, only other field information.
sortMissingLast is used to determine how you want documents that don't
have a value to appear -- if sortMissingLast=true then it doesn't matter
whether you sort "asc" or "desc", documents that don't have a value for
that field will allways come last. if sortMissingLast="false" then the
default Lucene sort behavior is used in which "missing" values are sorted
the same as empty strings -- it is the "lowest" possible value, so they
come first in asc sorts.
-Hoss