DO NOT REPLY [Bug 34407] New: - BooleanQuery assumes everything else implements skipTo

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http://issues.apache.org/bugzilla/show_bug.cgi?id=34407

           Summary: BooleanQuery assumes everything else implements skipTo
           Product: Lucene
           Version: 1.4
          Platform: All
        OS/Version: other
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Search
        AssignedTo: lucene-dev@jakarta.apache.org
        ReportedBy: yseeley@gmail.com


skipTo seems to be optional functionality on the Scorer class (BooleanScorer
doesn't implement it).  BooleanQuery.scorer() tests all subclauses using
"instanceof BooleanQuery" to determine if it can use a ConjunctionScorer that
requires skipTo functionality.

This means that any other new Query/Scorer that don't implement skipTo will get
into trouble when included in a BooleanQuery.

If skipTo is really optional, then there should be some way of telling by the
Scorer or the Query in a more generic manner.

Some options:
1) have a "boolean Scorer.hasSkipTo()" method
2) have a "boolean Query.hasSkipTo()" method
3) remove Scorer.skipTo and have a "public interface ScorerSkipTo{boolean
skipTo(int doc)}" that scorers may implement

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