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From: Arun Kumar K <arunk786@gmail.com>
Date: Thu, 6 Jun 2013 14:52:09 +0530
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Subject: FieldCache & DocValues Filter
To: java-user <java-user@lucene.apache.org>
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Hi Guys,

I was trying to better the filtering mechanism for my use case.
When i use the existing filters like FieldCacheTermsFilter, TermsFilter i
see that the first filtering take up enough time may be for building the
FieldCache. Subsequent filters are fast enough.
Currently, I am using CachingWrapperFilter over TermsFilter over String
Fields.

a) I want to reduce the FieldCache Building time or atleast first filters
time.

b) Instead can i build a filter over DocValues ?

    I have tried few things:
   1> I have SortedDocValueField like doc.add(new SortedDocValueField("ID",
new BytesRef("123"))) and created a
       TermsFilter based on BytesRef List for this field. But this doesn't
work.
   2> When i use the SortedDocValueField as group field for grouping it
works.

   Are there any ways out or did i miss somethings ?

Arun

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