Robert Muir created LUCENE-4273:
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Summary: 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
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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