Simon Willnauer created LUCENE-4687:
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Summary: Lazily initialize TermsEnum in BloomFilterPostingsFormat
Key: LUCENE-4687
URL: https://issues.apache.org/jira/browse/LUCENE-4687
Project: Lucene - Core
Issue Type: Bug
Components: core/codecs
Affects Versions: 4.0, 4.1
Reporter: Simon Willnauer
Fix For: 4.2, 5.0
BloomFilteringPostingsFormat initializes its delegate TermsEnum directly inside
the Terms#iterator() call which can be a pretty heavy operation if executed
thousands of times. I suspect that bloom filter postings are mainly used for
primary keys etc. which in turn is mostly a seekExact. Given that, most of the
time we don't even need the delegate termsenum since most of the segments won't
contain the key and the bloomfilter will likely return false from seekExact
without consulting the delegate.
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