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    Class ConstantScoreAutoRewrite

    A rewrite method that tries to pick the best constant-score rewrite method based on term and document counts from the query. If both the number of terms and documents is small enough, then CONSTANT_SCORE_BOOLEAN_QUERY_REWRITE is used. Otherwise, CONSTANT_SCORE_FILTER_REWRITE is used.

    Inheritance
    System.Object
    MultiTermQuery.RewriteMethod
    TermCollectingRewrite<BooleanQuery>
    ConstantScoreAutoRewrite
    Inherited Members
    TermCollectingRewrite<BooleanQuery>.AddClause(BooleanQuery, Term, Int32, Single)
    MultiTermQuery.RewriteMethod.GetTermsEnum(MultiTermQuery, Terms, AttributeSource)
    Namespace: Lucene.Net.Search
    Assembly: Lucene.Net.dll
    Syntax
    public class ConstantScoreAutoRewrite : TermCollectingRewrite<BooleanQuery>

    Fields

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    DEFAULT_DOC_COUNT_PERCENT

    If the query will hit more than 1 in 1000 of the docs in the index (0.1%), the filter method is fastest:

    Declaration
    public static double DEFAULT_DOC_COUNT_PERCENT
    Field Value
    Type Description
    System.Double
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    DEFAULT_TERM_COUNT_CUTOFF

    Defaults derived from rough tests with a 20.0 million doc Wikipedia index. With more than 350 terms in the query, the filter method is fastest:

    Declaration
    public static int DEFAULT_TERM_COUNT_CUTOFF
    Field Value
    Type Description
    System.Int32

    Properties

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    DocCountPercent

    If the number of documents to be visited in the postings exceeds this specified percentage of the MaxDoc for the index, then CONSTANT_SCORE_FILTER_REWRITE is used. Value may be 0.0 to 100.0.

    Declaration
    public virtual double DocCountPercent { get; set; }
    Property Value
    Type Description
    System.Double
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    TermCountCutoff

    If the number of terms in this query is equal to or larger than this setting then CONSTANT_SCORE_FILTER_REWRITE is used.

    Declaration
    public virtual int TermCountCutoff { get; set; }
    Property Value
    Type Description
    System.Int32

    Methods

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    AddClause(BooleanQuery, Term, Int32, Single, TermContext)

    Declaration
    protected override void AddClause(BooleanQuery topLevel, Term term, int docFreq, float boost, TermContext states)
    Parameters
    Type Name Description
    BooleanQuery topLevel
    Term term
    System.Int32 docFreq
    System.Single boost
    TermContext states
    Overrides
    Lucene.Net.Search.TermCollectingRewrite<Lucene.Net.Search.BooleanQuery>.AddClause(Lucene.Net.Search.BooleanQuery, Lucene.Net.Index.Term, System.Int32, System.Single, Lucene.Net.Index.TermContext)
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    Equals(Object)

    Declaration
    public override bool Equals(object obj)
    Parameters
    Type Name Description
    System.Object obj
    Returns
    Type Description
    System.Boolean
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    GetHashCode()

    Declaration
    public override int GetHashCode()
    Returns
    Type Description
    System.Int32
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    GetTopLevelQuery()

    Declaration
    protected override BooleanQuery GetTopLevelQuery()
    Returns
    Type Description
    BooleanQuery
    Overrides
    Lucene.Net.Search.TermCollectingRewrite<Lucene.Net.Search.BooleanQuery>.GetTopLevelQuery()
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    Rewrite(IndexReader, MultiTermQuery)

    Declaration
    public override Query Rewrite(IndexReader reader, MultiTermQuery query)
    Parameters
    Type Name Description
    IndexReader reader
    MultiTermQuery query
    Returns
    Type Description
    Query
    Overrides
    MultiTermQuery.RewriteMethod.Rewrite(IndexReader, MultiTermQuery)
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