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https://issues.apache.org/jira/browse/LUCENE-5029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13683723#comment-13683723
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Han Jiang commented on LUCENE-5029:
-----------------------------------
{quote}
Also, at write time, it'd be nice if the PBF got a DataOutput +
LongsRef from the terms dict which it could write the term data to,
and a "matching" DataInput + LongsRef at read time. I'm not sure
these even need to reside in BlockTermState?
{quote}
Yes, we can move those byte[] and DataI/O into TermState, so that the API
will be simpler. But with this change, the concept of 'TermState' needs more
explanation & javadocs now.
> 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.algebra.patch, LUCENE-5029.patch,
> LUCENE-5029.patch, 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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