Mahesh created LUCENE-7493:
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Summary: 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
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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