Simon Willnauer created LUCENE-4688:
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Summary: Reuse TermsEnum in BlockTreeTermsReader
Key: LUCENE-4688
URL: https://issues.apache.org/jira/browse/LUCENE-4688
Project: Lucene - Core
Issue Type: Improvement
Components: core/codecs
Affects Versions: 4.0, 4.1
Reporter: Simon Willnauer
Fix For: 4.2, 5.0
Opening a TermsEnum comes with a significant cost at this point if done
frequently like primary key lookups or if many segments are present. Currently
we don't reuse it at all and create a lot of objects even if the enum is just
used for a single seekExact (ie. TermQuery). Stressing the
Terms#iterator(reuse) call shows significant gains with reuse...
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