Peng Cheng created LUCENE-5409:
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Summary: ToParentBlockJoinCollector.getTopGroups returns empty
Groups
Key: LUCENE-5409
URL: https://issues.apache.org/jira/browse/LUCENE-5409
Project: Lucene - Core
Issue Type: Bug
Components: core/search
Affects Versions: 4.6
Environment: Ubuntu 12.04
Reporter: Peng Cheng
Priority: Critical
Fix For: 4.7
In the scorer generation stage, the ToParentBlockJoinCollector will
automatically rewrite all the associated ToParentBlockJoinQuery (and their
subqueries), and save them into its in-memory Look-up table, namely joinQueryID
(see enroll() method for detail). Unfortunately, in the getTopGroups method,
the new ToParentBlockJoinQuery parameter is not rewritten (at least users are
not expected to do so). When the new one is searched in the old lookup table
(considering the impact of rewrite() on hashCode()), the result (namely _slot)
will always fail and eventually end up with a topGroup collection consisting of
only empty groups (their hitCounts are guaranteed to be zero).
An easy fix would be to rewrite the original BlockJoinQuery before invoking
getTopGroups method. However, the computational cost of this is not optimal. A
better but slightly more complex solution would be to save unrewrited Queries
into the lookup table.
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