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From Martijn v Groningen <>
Subject Re: FieldCache future?
Date Fri, 24 Feb 2012 09:23:19 GMT
>> Grouping etc could work solely on a docvalues api and maybe they have
>> a special ctor to take a SortedBytes impl (and fieldcache implements
>> the docvalues api or some other backwards mechanism).
>> This would remove the redundant implementations (both fieldcache and
>> DV implementations) in stuff like grouping, join, sort, etc
+1 That is great, b/c there already are docvalues based grouping

We don't need to have a special SortedBytes ctor, right? The grouping
ctors do take a DocValues.Type (joining, faceting etc can do the
same). In the setNextReader method IR.docValues(groupField) is

I'll also close LUCENE-3360 since it only couples the FC with IR.

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