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https://issues.apache.org/jira/browse/LUCENE-4273?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir updated LUCENE-4273:
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Attachment: LUCENE-4273.patch
> Fix DocsEnum freq flag consistent with DocsAndPositionsEnum flags
> -----------------------------------------------------------------
>
> Key: LUCENE-4273
> URL: https://issues.apache.org/jira/browse/LUCENE-4273
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Fix For: 4.0
>
> Attachments: LUCENE-4273.patch
>
>
> Followup from LUCENE-4230
> Currently today to pull freq() from a docsEnum, you have to pass a boolean
> 'needsFreqs=true'. If the field omitsTF, then it returns null (and you need
> to call it again, with 'needsFreqs=false', in which case you are not supposed
> to call freq().
> We fixed this in D&PEnum in 4230: as you can tell from the fieldinfos whether
> they are there or not, there is no need to return null, it makes consumer
> code complicated.
> So this issue is just to have docs(Bits, reuse) which calls docs(Bits, reuse,
> FLAG_FREQS) by default. if they arent there, the docsenum returns 1 for
> freq().
> So calling docs(Bits, reuse, 0) is just an optimization hint to the codec
> that you never need them (same as the payload/offset flags for
> docsAndPositions)
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