TopDocsCollector should not be declared with generic <T>
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Key: LUCENE-2057
URL: https://issues.apache.org/jira/browse/LUCENE-2057
Project: Lucene - Java
Issue Type: Bug
Components: Search
Reporter: Shai Erera
Fix For: 3.0
TopDocsCollector was changed to be TopDocsCollector<T>. However it has methods
which specifically assume the PQ stores ScoreDoc. Therefore, if someone extends
it and defines a type which is not ScoreDoc, things will break.
We shouldn't put <T> on TopDocsCollector at all, but rather change its ctor to
*protected TopDocsCollector(PriorityQueue<? extends ScoreDoc> pq)*.
TopDocsCollector should handle ScoreDoc types. If we do this, we'll need to
change FieldValueHitQueue's Entry to extend ScoreDoc as well.
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