Adrien Grand created LUCENE-6328:
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Summary: Make Filter.clone and Filter.setBoost throw an
UnsupportedOperationException
Key: LUCENE-6328
URL: https://issues.apache.org/jira/browse/LUCENE-6328
Project: Lucene - Core
Issue Type: Bug
Reporter: Adrien Grand
Assignee: Adrien Grand
Priority: Minor
Fix For: Trunk, 5.1
The rewrite process uses a combination of calls to clone() and setBoost(boost)
in order to rewrite queries. This is a bit weird for filters given that they
were not originally designed to care about scoring.
Using a filter directly as a query fails unit tests today since filters do not
pass the QueryUtils checks: it is expected that cloning and changing the boost
results in an instance which is unequal. However existing filters do not take
into account the getBoost() parameter inherited from Query so this test fails.
I think it would be less error-prone to throw an UnsupportedOperationException
for clone() and setBoost() on filters and disable the check in QueryUtils for
filters.
In order to keep rewriting working, filters could rewrite to a CSQ around
themselves so that clone() and setBoost() would be called on the CSQ.
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