Class DocValuesFieldExistsQuery


public final class DocValuesFieldExistsQuery extends Query
A Query that matches documents that have a value for a given field as reported by doc values iterators.
  • Constructor Details

    • DocValuesFieldExistsQuery

      public DocValuesFieldExistsQuery(String field)
      Create a query that will match documents which have a value for the given field.
  • Method Details

    • getField

      public String getField()
    • equals

      public boolean equals(Object other)
      Description copied from class: Query
      Override and implement query instance equivalence properly in a subclass. This is required so that QueryCache works properly.

      Typically a query will be equal to another only if it's an instance of the same class and its document-filtering properties are identical that other instance. Utility methods are provided for certain repetitive code.

      Specified by:
      equals in class Query
      See Also:
    • hashCode

      public int hashCode()
      Description copied from class: Query
      Override and implement query hash code properly in a subclass. This is required so that QueryCache works properly.
      Specified by:
      hashCode in class Query
      See Also:
    • toString

      public String toString(String field)
      Description copied from class: Query
      Prints a query to a string, with field assumed to be the default field and omitted.
      Specified by:
      toString in class Query
    • visit

      public void visit(QueryVisitor visitor)
      Description copied from class: Query
      Recurse through the query tree, visiting any child queries
      Specified by:
      visit in class Query
      visitor - a QueryVisitor to be called by each query in the tree
    • rewrite

      public Query rewrite(IndexReader reader) throws IOException
      Description copied from class: Query
      Expert: called to re-write queries into primitive queries. For example, a PrefixQuery will be rewritten into a BooleanQuery that consists of TermQuerys.
      rewrite in class Query
    • createWeight

      public Weight createWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost)
      Description copied from class: Query
      Expert: Constructs an appropriate Weight implementation for this query.

      Only implemented by primitive queries, which re-write to themselves.

      createWeight in class Query
      scoreMode - How the produced scorers will be consumed.
      boost - The boost that is propagated by the parent queries.
    • getDocValuesDocIdSetIterator

      public static DocIdSetIterator getDocValuesDocIdSetIterator(String field, LeafReader reader) throws IOException
      Returns a DocIdSetIterator from the given field or null if the field doesn't exist in the reader or if the reader has no doc values for the field.