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
System.Object.Equals(System.Object, System.Object)
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.ToString()
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
Overrides
System.Object.Equals(System.Object)
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GetHashCode()

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