[jira] [Updated] (LUCENE-5028) doShare is pointless in PositiveIntOutputs

["Han Jiang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-5028?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Han Jiang updated LUCENE-5028:
------------------------------

    Summary: doShare is pointless in PositiveIntOutputs  (was: doShare is in PositiveIntOutputs)
    
> doShare is pointless in PositiveIntOutputs
> ------------------------------------------
>
>                 Key: LUCENE-5028
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5028
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/FSTs
>            Reporter: Han Jiang
>            Assignee: Han Jiang
>            Priority: Minor
>             Fix For: 5.0
>
>
> We recently use this in oal.core.fst.PositiveIntOutputs to indicate whether to share outputs. The comment mentioned 'with doShare=false, in some case this may result in a smaller FST'. However, this is not intuitive, as for long type, we always have the smallest output reduced to NO_OUTPUT, thus the smallest one is 'moved' towards root, and no extra output is created.
> However, if there are many many small outputs around root arcs, when we share outputs, a large output might be pushed into the root arcs. When root arcs are packed as fixed-array, yes the size of FST is increased. But, I suppose this should invoke other intuitive heuristics, instead of the confusing 'doShare'?
> Besides, this only exist in PositiveIntOutputs.

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