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From "Michael McCandless (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-2929) all postings enums must explicitly declare what they need up-front.
Date Tue, 20 Mar 2012 15:21:39 GMT

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

Michael McCandless updated LUCENE-2929:
---------------------------------------

    Labels: gsoc2012 lucene-gsoc-12  (was: )

Still need "requiresPayloads" boolean.
                
> 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 - Java
>          Issue Type: Task
>            Reporter: Robert Muir
>              Labels: gsoc2012, lucene-gsoc-12
>             Fix For: 4.0
>
>         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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