Package org.apache.lucene.queries.function

# Class FunctionMatchQuery

java.lang.Object
org.apache.lucene.search.Query
org.apache.lucene.queries.function.FunctionMatchQuery

public final class FunctionMatchQuery extends Query
A query that retrieves all documents with a `DoubleValues` value matching a predicate

This query works by a linear scan of the index, and is best used in conjunction with other queries that can restrict the number of documents visited

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `FunctionMatchQuery(DoubleValuesSource source, DoublePredicate filter)`
  Create a FunctionMatchQuery with default TwoPhaseIterator matchCost - `DEFAULT_MATCH_COST` = 100.0f
  `FunctionMatchQuery(DoubleValuesSource source, DoublePredicate filter, float matchCost)`
  Create a FunctionMatchQuery

- ## Method Summary

  Modifier and Type
  Method
  Description
  `Weight`
  `createWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost)`
  `boolean`
  `equals(Object o)`
  `int`
  `hashCode()`
  `String`
  `toString(String field)`
  `void`
  `visit(QueryVisitor visitor)`

  ### Methods inherited from class org.apache.lucene.search.Query

  `classHash, rewrite, sameClassAs, toString`

  ### Methods inherited from class java.lang.Object

  `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

- ## Constructor Details

  - ### FunctionMatchQuery

    public FunctionMatchQuery(DoubleValuesSource source, DoublePredicate filter)
    Create a FunctionMatchQuery with default TwoPhaseIterator matchCost - `DEFAULT_MATCH_COST` = 100.0f
    Parameters:
      `source` - a `DoubleValuesSource` to use for values
      `filter` - the predicate to match against

  - ### FunctionMatchQuery

    public FunctionMatchQuery(DoubleValuesSource source, DoublePredicate filter, float matchCost)
    Create a FunctionMatchQuery
    Parameters:
      `source` - a `DoubleValuesSource` to use for values
      `filter` - the predicate to match against
      `matchCost` - to be returned by `TwoPhaseIterator.matchCost()`

- ## Method Details

  - ### toString

    public String toString(String field)
    Specified by:
      `toString` in class `Query`

  - ### visit

    public void visit(QueryVisitor visitor)
    Specified by:
      `visit` in class `Query`

  - ### createWeight

    public Weight createWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost) throws IOException
    Overrides:
      `createWeight` in class `Query`
    Throws:
      `IOException`

  - ### equals

    public boolean equals(Object o)
    Specified by:
      `equals` in class `Query`

  - ### hashCode

    public int hashCode()
    Specified by:
      `hashCode` in class `Query`