BlockJoinQuery advance fails on an assert in case of a single parent with child
segment
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Key: LUCENE-3600
URL: https://issues.apache.org/jira/browse/LUCENE-3600
Project: Lucene - Java
Issue Type: Bug
Components: modules/join
Affects Versions: 3.5
Reporter: Shay Banon
The BlockJoinQuery will fail on an assert when advance in called on a segment
with a single parent with a child. The call to
parentBits.prevSetBit(parentTarget - 1) will cause -1 to be returned, and the
assert will fail, though its valid. Just removing the assert fixes the problem,
since nextDoc will handle it properly.
Also, I don't understand the "assert parentTarget != 0;", with a comment of
each parent must have one child. There isn't really a reason to add this
constraint, as far as I can tell..., just call nextDoc in this case, no?
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