[jira] [Resolved] (LUCENE-5819) Add block tree postings format that supports term ords

["Michael McCandless (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-5819?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael McCandless resolved LUCENE-5819.
----------------------------------------

    Resolution: Fixed

> Add block tree postings format that supports term ords
> ------------------------------------------------------
>
>                 Key: LUCENE-5819
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5819
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/other
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 5.0, 4.10
>
>         Attachments: LUCENE-5819.patch, LUCENE-5819.patch
>
>
> BlockTree is our default terms dictionary today, but it doesn't
> support term ords, which is an optional API in the postings format to
> retrieve the ordinal for the currently seek'd term, and also later
> seek by that ordinal e.g. to lookup the term.
> This can possibly be useful for e.g. faceting, and maybe at some point
> we can share the postings terms dict with the one used by sorted/set
> DV for cases when app wants to invert and facet on a given field.
> The older (3.x) block terms dict can easily support ords, and we have
> a Lucene41OrdsPF in test-framework, but it's not as fast / compact as
> block-tree, and doesn't (can't easily) implement an optimized
> intersect, but it could be for fields we'd want to facet on, these
> tradeoffs don't matter.  It's nice to have options...



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