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https://issues.apache.org/jira/browse/SOLR-12572?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16590613#comment-16590613
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ASF subversion and git services commented on SOLR-12572:
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Commit dfd2801cd27ccc1e24179cc0ee5768a22bb2e64c in lucene-solr's branch
refs/heads/master from [~varunthacker]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=dfd2801 ]
SOLR-12572: While exporting documents using the export writer, if a field is
specified as a sort parameter and also in the fl (field list) parameter, we
save on one doc-value lookup. This can bring performance improvements of 15%
and upwards depending on how many fields are in common
> Reuse fieldvalues computed while sorting at writing in ExportWriter
> -------------------------------------------------------------------
>
> Key: SOLR-12572
> URL: https://issues.apache.org/jira/browse/SOLR-12572
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: streaming expressions
> Reporter: Amrit Sarkar
> Assignee: Varun Thacker
> Priority: Minor
> Attachments: SOLR-12572.patch, SOLR-12572.patch, SOLR-12572.patch,
> SOLR-12572.patch, SOLR-12572.patch, SOLR-12572.patch, SOLR-12572.patch,
> SOLR-12572.patch
>
>
> While exporting result through "/export" handler,
> {code:java}
> http://localhost:8983/solr/core_name/export?q=my-query&sort=severity+desc,timestamp+desc&fl=severity,timestamp,msg
> {code}
> Doc-values are sought for all the {{sort}} fields defined (in this example
> 'severity, 'timestamp'). When we stream out docs we again make doc-value
> seeks against the {{fl}} fields ('severity','timestamp','msg') .
> In most common use-cases we have {{fl = sort}} fields, or atleast the sort
> fields are subset of {{fl}} fields, so if we can *pre-collect* the values
> while sorting it, we can reduce the doc-value seeks potentially bringing
> *speed improvement*.
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