Robert Muir created LUCENE-5454:
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Summary: SortField for SortedSetDV
Key: LUCENE-5454
URL: https://issues.apache.org/jira/browse/LUCENE-5454
Project: Lucene - Core
Issue Type: New Feature
Components: modules/other
Reporter: Robert Muir
Currently, its not possible to sort by a sortedsetdv (e.g. a multi-valued
field). So the idea is to provide some comparators that let you do this: by
choosing a selector (e.g. min/max/median type stuff) that picks a value from
the set as a representative sort value.
The implementation is pretty simple, just actually wrap the SortedSet in a
SortedDV that does the selection, and re-use the existing TermOrdValComparator
logic.
One issue is that, with the current sortedset API only 'min' is a viable option
because its the only one that can be done in constant time. So this patch adds
an optional extension (RandomAccessOrds) for codecs that can support random
access. I added this to the default codec, diskdv, and direct, as they can all
easily support it. While this could be useful for other purposes (e.g. min/max
as valuesource or whatever), i think its best to be optional because it
prevents some forms of encoding/compression.
Anyway I'm targeting lucene/sandbox with this change...
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