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https://issues.apache.org/jira/browse/LUCENE-5029?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Han Jiang updated LUCENE-5029:
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Attachment: LUCENE-5029.patch
A patch full of nocommits...
For 'common()' operation, simply pickup the smaller one, vice versa. And when
two LongsRef are not comparable (e.g. one intermediate TermState vs. another
intermediate), we can ignore that.
This behavior is quite different from current Outputs like PairOutputs, and of
course we have other alternatives to test.
> factor out a generic 'TermState' for better sharing in FST-based term dict
> --------------------------------------------------------------------------
>
> Key: LUCENE-5029
> URL: https://issues.apache.org/jira/browse/LUCENE-5029
> Project: Lucene - Core
> Issue Type: Sub-task
> Reporter: Han Jiang
> Assignee: Han Jiang
> Priority: Minor
> Fix For: 4.4
>
> Attachments: LUCENE-5029.patch
>
>
> Currently, those two FST-based term dict (memory codec & blocktree) all use
> FST<BytesRef> as a base data structure, this might not share much data in
> parent arcs, since the encoded BytesRef doesn't guarantee that
> 'Outputs.common()' always creates a long prefix.
> While for current postings format, it is guaranteed that each FP (pointing to
> .doc, .pos, etc.) will increase monotonically with 'larger' terms. That
> means, between two Outputs, the Outputs from smaller term can be safely
> pushed towards root. However we always have some tricky TermState to deal
> with (like the singletonDocID for pulsing trick), so as Mike suggested, we
> can simply cut the whole TermState into two parts: one part for comparation
> and intersection, another for restoring generic data. Then the data structure
> will be clear: this generic 'TermState' will consist of a fixed-length
> LongsRef and variable-length BytesRef.
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