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https://issues.apache.org/jira/browse/SOLR-17322?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Christine Poerschke reassigned SOLR-17322:
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Assignee: Christine Poerschke
> Make RankQuery.getTopDocsCollector use covariant generic types
> --------------------------------------------------------------
>
> Key: SOLR-17322
> URL: https://issues.apache.org/jira/browse/SOLR-17322
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: search
> Affects Versions: 9.0, 9.1, 9.2, 9.1.1, 9.3, 9.2.1, 9.4, 9.5, 9.4.1, 9.6,
> 9.6.1
> Reporter: Stephen Woods
> Assignee: Christine Poerschke
> Priority: Trivial
> Time Spent: 1h
> Remaining Estimate: 0h
>
> Currently, rank queries can only use TopDocsCollectors that operate on
> ScoreDocs.
> TopDocsCollector has a class signature of:
> {code:java}
> public abstract class TopDocsCollector<T extends ScoreDoc> implements
> Collector {code}
> It contains a single covariant generic type T, which allows the collection of
> not only ScoreDocs, but subclasses of ScoreDocs as well (in the event
> additional information needs to be collected per document during the
> collection process).
> SOLR-15385 involved a large commit that removed raw types from much of the
> Solr code base. As part of that work, RankQuery was modified so that the
> getTopDocsCollector method no longer returns a raw TopDocsCollector but
> instead returns a TopDocsCollector of invariant ScoreDocs. Unfortunately, by
> doing so, it is no longer possible to use custom TopDocsCollectors that
> operate on types that extend ScoreDoc in rank queries; they _only_ work with
> ScoreDocs. Any attempt to use a class other than ScoreDoc will result in a
> compilation error.
> The fix for this issue is very simple: Modify the method signature from:
> {code:java}
> public abstract TopDocsCollector<ScoreDoc> getTopDocsCollector(
> int len, QueryCommand cmd, IndexSearcher searcher) throws IOException;
> {code}
> to
> {code:java}
> public abstract TopDocsCollector<? extends ScoreDoc> getTopDocsCollector(
> int len, QueryCommand cmd, IndexSearcher searcher) throws IOException;
> {code}
> The call site for this method, within
> SolrIndexSearcher.buildTopDocsCollector, already uses this type signature.
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