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https://issues.apache.org/jira/browse/LUCENE-4404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13457773#comment-13457773
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Michael McCandless commented on LUCENE-4404:
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That's a good point about the bit-stealing: I forgot it did that. So I agree
the new ListOfOutputs will likely make a larger FST ... but it shouldn't be so
bad since it's only on the node-final outputs that it adds a byte. Also it's
more general (can wrap any output (not just PositiveInt), can hold an arbitrary
number).
So I'll revive UpToTwoPositiveIntOutputs, and move it to misc (nobody actually
uses it today... I think BlockTree had used it at one point), and put this new
ListOfOutputs into misc too.
> Add ListOfOutputs FST Outputs, replacing UpToTwoPositiveIntOutputs
> ------------------------------------------------------------------
>
> Key: LUCENE-4404
> URL: https://issues.apache.org/jira/browse/LUCENE-4404
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Attachments: LUCENE-4404.patch
>
>
> Spinoff from LUCENE-3842. This just generalizes the
> UpToTwoPositiveIntOutputs to a list of any arbitrary output, by
> wrapping any other Outputs impl. I also made separate methods to
> write/read a node-final output: since list of values can only occur on
> a final node output, this impl optimizes and avoids writing an extra
> byte per label for normal arc labels.
> This also fixes a bug in Builder that was sometimes failing to join
> multiple outputs together.
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