CustomScoreQuery should support multiple ValueSourceQueries
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Key: LUCENE-1019
URL: https://issues.apache.org/jira/browse/LUCENE-1019
Project: Lucene - Java
Issue Type: Improvement
Components: Search
Affects Versions: 2.2
Reporter: Kyle Maxwell
CustomScoreQuery's constructor currently accepts a subQuery, and a
ValueSourceQuery. I would like it to accept multiple ValueSourceQueries. The
workaround of nested CustomScoreQueries works for simple cases, but it quickly
becomes either cumbersome to manage, or impossible to implement the desired
function.
This patch implements CustomMultiScoreQuery with my desired functionality, and
refactors CustomScoreQuery to implement the special case of a
CustomMultiScoreQuery with 0 or 1 ValueSourceQueries. This keeps the
CustomScoreQuery API intact.
This patch includes basic tests, more or less taken from the original
implementation, and customized a bit to cover the new cases.
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