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https://issues.apache.org/jira/browse/LUCENE-7493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15574923#comment-15574923
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Michael McCandless commented on LUCENE-7493:
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Thank you [~maahi333].
Hmm but there is a problem with your change inside {{FacetsCollector}}: I think
in the limit=0 case you will get no facet results, because you make a new
{{FacetCollector}} rather than using the {{Collector}} passed in by the user?
Can you improve the test to confirm that you do get facet results with limit=0,
which should fail, and then fix your changes in {{FacetsCollector}} and then
the test should pass?
> Support of TotalHitCountCollector for FacetCollector.search api if numdocs
> passed as zero.
> ------------------------------------------------------------------------------------------
>
> Key: LUCENE-7493
> URL: https://issues.apache.org/jira/browse/LUCENE-7493
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Mahesh
> Attachments: LUCENE-7493-Fail-TestCase.patch,
> LUCENE-7493-Pass-TestCase.patch
>
>
> Hi,
> I want to do drill down search using FacetCollection below is the code
> FacetsCollector facetCollector = new FacetsCollector();
> TopDocs topDocs = FacetsCollector.search(st.searcher, filterQuery, limit,
> facetCollector);
> I just want facet information so I pass limit as zero but I get error
> "numHits must be > 0; please use TotalHitCountCollector if you just need the
> total hit count".
> For FacetCollector there is no way to initialize 'TotalHitCountCollector'.
> Internally it always create either 'TopFieldCollector' or
> 'TopScoreDocCollector' which does not allow limit as 0.
> So if limit should be zero then there should be a way that
> 'TotalHitCountCollector' should be initialized.
> Better way would be to provide an api which takes query and collector as
> inputs just like 'drillSideways.search(filterQuery, totalHitCountCollector)'.
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