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https://issues.apache.org/jira/browse/LUCENE-2785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12965172#action_12965172
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Uwe Schindler commented on LUCENE-2785:
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+1, I needed the same. Its often a use case to simply get number of results.
And a PQ with one entry and all the logic does not make sense here. We should
just count hits.
> TopFieldCollector throws AIOOBE if numHits is 0
> -----------------------------------------------
>
> Key: LUCENE-2785
> URL: https://issues.apache.org/jira/browse/LUCENE-2785
> Project: Lucene - Java
> Issue Type: Bug
> Components: Search
> Reporter: Michael McCandless
> Priority: Minor
> Fix For: 3.1, 4.0
>
>
> See solr-user thread "ArrayIndexOutOfBoundsException for query with rows=0
> and sort param".
> I think we should just create a null collector (only tallies up totalHits) if
> numHits is 0?
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