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From Michael McCandless <>
Subject Big Bad Bug in Lucene 2.9.0
Date Wed, 14 Oct 2009 12:59:40 GMT

There is a nasty bug in 2.9.0, whereby BooleanQuery will sometimes
silently fail to match possibly many documents that it should.
Details are here:

Fortunately, there is a very simple workaround: just call
BooleanQuery.setAllowDocsOutOfOrder(false).  This is a static default;
you only have to call it once, before running any searches.

We are working towards getting a 2.9.1 out to fix this bug... if you
know of issues we've fixed on Lucene's trunk that'd be good candidates
for porting back to 2.9.1, speak up!



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