Simon Willnauer created LUCENE-4607:
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Summary: Add estimateDocCount to DocIdSetIterator
Key: LUCENE-4607
URL: https://issues.apache.org/jira/browse/LUCENE-4607
Project: Lucene - Core
Issue Type: Bug
Components: core/search
Affects Versions: 4.0
Reporter: Simon Willnauer
Fix For: 4.1, 5.0
this is essentially a spinnoff from LUCENE-4236
We currently have no way to make any decsision on how costly a DISI is neither
when we apply filters nor when we build conjunctions in BQ. Yet we have most of
the information already and can easily expose them via a cost API such that BS
and FilteredQuery can apply optimizations on per segment basis.
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