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https://issues.apache.org/jira/browse/SOLR-10732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17246665#comment-17246665
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Munendra S N commented on SOLR-10732:
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{quote}if perhaps you arrived at working on this because you encountered
performance issues that would be addressed by this change{quote}
I had few tickets in backburner from long time and had some spare time during
this holiday rooster so, was trying cleanup few of those tickets, this is one
of those tickets.
If there are any objections, would be happy to address else I would like
proceed and commit this probably during weekend.
> potential optimizations in callers of SolrIndexSearcher.numDocs when docset
> is empty
> ------------------------------------------------------------------------------------
>
> Key: SOLR-10732
> URL: https://issues.apache.org/jira/browse/SOLR-10732
> Project: Solr
> Issue Type: Improvement
> Reporter: Chris M. Hostetter
> Priority: Major
> Attachments: SOLR-10732.patch
>
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> spin off of SOLR-10727...
> {quote}
> ...why not (also) optimize it slightly higher up and completely avoid the
> construction of the Query objects? (and in some cases: additional overhead)
> for example: the first usage of {{SolrIndexSearcher.numDocs(Query,DocSet)}} i
> found was {{RangeFacetProcessor.rangeCount(DocSet subset,...)}} ... if the
> first line of that method was {{if (0 == subset.size()) return 0}} then we'd
> not only optimize away the SolrIndexSearcher hit, but also fetching the
> SchemaField & building the range query (not to mention the much more
> expensive {{getGroupedFacetQueryCount}} in the grouping case)
> At a glance, most other callers of
> {{SolrIndexSearcher.numDocs(Query,DocSet)}} could be trivially optimize this
> way as well -- at a minimum to eliminate Query parsing/construction.
> {quote}
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