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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-2929) all postings enums must explicitly declare what they need up-front.
Date Thu, 09 May 2013 23:05:55 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2929?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Uwe Schindler updated LUCENE-2929:
----------------------------------

    Fix Version/s:     (was: 4.3)
                   4.4
    
> all postings enums must explicitly declare what they need up-front.
> -------------------------------------------------------------------
>
>                 Key: LUCENE-2929
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2929
>             Project: Lucene - Core
>          Issue Type: Task
>            Reporter: Robert Muir
>              Labels: gsoc2013
>             Fix For: 4.4
>
>         Attachments: LUCENE-2929.patch, LUCENE-2929.patch, LUCENE-2929.patch
>
>
> Currently, the DocsEnum api assumes you *might* consumes freqs at any time.
> Additionally the DocsAndPositionsEnum api assumes you *might* consume a payload at any
time.
> High level things such as queries know what kinds of data they need from the index up-front,
> and the current APIs are limiting to codecs (other than Standard, which has these intertwined).
> So, we either need DocsAndFreqsEnum, DocsPositionsAndPayloadsEnum, or at least booleans
> in the methods that create these to specify whether you want freqs or payloads.
> we did this for freqs in the bulkpostings API, which is good, but these DocsEnum apis
> are also new in 4.0 and there's no reason to introduce non-performant APIs.
> additionally when/if we add payloads to the bulkpostings API, we should make sure we
keep
> the same trend and require you to specify you want payloads or not up-front.

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