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Posted to dev@lucene.apache.org by "Joel Bernstein (JIRA)" <ji...@apache.org> on 2015/01/12 16:02:35 UTC
[jira] [Resolved] (SOLR-6581) Efficient DocValues support and
numeric collapse field implementations for Collapse and Expand
[ https://issues.apache.org/jira/browse/SOLR-6581?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Joel Bernstein resolved SOLR-6581.
----------------------------------
Resolution: Fixed
> Efficient DocValues support and numeric collapse field implementations for Collapse and Expand
> ----------------------------------------------------------------------------------------------
>
> Key: SOLR-6581
> URL: https://issues.apache.org/jira/browse/SOLR-6581
> Project: Solr
> Issue Type: Bug
> Reporter: Joel Bernstein
> Assignee: Joel Bernstein
> Priority: Minor
> Fix For: 5.0, Trunk
>
> Attachments: SOLR-6581.patch, SOLR-6581.patch, SOLR-6581.patch, SOLR-6581.patch, SOLR-6581.patch, SOLR-6581.patch, SOLR-6581.patch, SOLR-6581.patch, SOLR-6581.patch, SOLR-6581.patch, SOLR-6581.patch, SOLR-6581.patch, SOLR-6581.patch, SOLR-6581.patch, SOLR-6581.patch, renames.diff
>
>
> The 4x implementation of the CollapsingQParserPlugin and the ExpandComponent are optimized to work with a top level FieldCache. Top level FieldCaches have a very fast docID to top-level ordinal lookup. Fast access to the top-level ordinals allows for very high performance field collapsing on high cardinality fields.
> LUCENE-5666 unified the DocValues and FieldCache api's so that the top level FieldCache is no longer in regular use. Instead all top level caches are accessed through MultiDocValues.
> This ticket does the following:
> 1) Optimizes Collapse and Expand to use MultiDocValues and makes this the default approach when collapsing on String fields
> 2) Provides an option to use a top level FieldCache if the performance of MultiDocValues is a blocker. The mechanism for switching to the FieldCache is a new "hint" parameter. If the hint parameter is set to "FAST_QUERY" then the top-level FieldCache would be used for both Collapse and Expand.
> Example syntax:
> {code}
> fq={!collapse field=x hint=FAST_QUERY}
> {code}
> 3) Adds numeric collapse field implementations.
>
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