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https://issues.apache.org/jira/browse/LUCENE-3121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13189175#comment-13189175
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Michael McCandless commented on LUCENE-3121:
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bq. Yes, that is in fact the very idea I had originally that I raised on the
list that you in turn created this JIRA issue for.
Aha! Thanks for reminding me :) I think it would work well... the FST should
compress the terms nicely; just a question of at what cost to lookup time.
But, then, for some cases of DV/FC consumption the doc -> ord lookup is far
more important (which wouldn't change), so it could be a good win...
> FST should offer lookup-by-output API when output strictly increases
> --------------------------------------------------------------------
>
> Key: LUCENE-3121
> URL: https://issues.apache.org/jira/browse/LUCENE-3121
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/other
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 3.6, 4.0
>
> Attachments: LUCENE-3121.patch
>
>
> Spinoff from "FST and FieldCache" java-dev thread
> http://lucene.markmail.org/thread/swoawlv3fq4dntvl
> FST is able to associate arbitrary outputs with the sorted input keys, but in
> the special (and, common) case where the function is strictly monotonic (each
> output only "increases" vs prior outputs), such as mapping to term ords or
> mapping to file offsets in the terms dict, we should offer a lookup-by-output
> API that efficiently walks the FST and locates input key (exact or floor or
> ceil) matching that output.
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