Shai Erera created LUCENE-5045:
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Summary: DrillSideways.create yields IllegalArgEx if given
IndexReader is empty
Key: LUCENE-5045
URL: https://issues.apache.org/jira/browse/LUCENE-5045
Project: Lucene - Core
Issue Type: Bug
Components: modules/facet
Reporter: Shai Erera
Assignee: Shai Erera
DrillSideways.create() creates either TopScoreDocCollector or TopFieldCollector
with numHits = min(topN, reader.maxDoc()). When the reader is empty, these
collectors throw IllegalArgEx that numHits should be > 0. While this is a
correct behavior on their part, I think the behavior in DS is wrong. It's an
optimization to ask for min(topN, reader.maxDoc(), i.e. if it just delegated
topN all was well. So if we'd like to keep the optimization, we should at least
make it min(topN,maxDoc+1), because there's nothing technically wrong from
running a search against an empty index.
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