Package org.apache.lucene.search

Class IndexSortSortedNumericDocValuesRangeQuery

java.lang.Object
org.apache.lucene.search.Query
org.apache.lucene.search.IndexSortSortedNumericDocValuesRangeQuery
public class IndexSortSortedNumericDocValuesRangeQuery extends Query
A range query that can take advantage of the fact that the index is sorted to speed up execution. If the index is sorted on the same field as the query, it performs binary search on the field's numeric doc values to find the documents at the lower and upper ends of the range. This optimized execution strategy is only used if the following conditions hold:
  • The index is sorted, and its primary sort is on the same field as the query.
  • The query field has either SortedNumericDocValues or NumericDocValues.
  • The segments must have at most one field value per document (otherwise we cannot easily determine the matching document IDs through a binary search).
If any of these conditions isn't met, the search is delegated to fallbackQuery. This fallback must be an equivalent range query -- it should produce the same documents and give constant scores. As an example, an IndexSortSortedNumericDocValuesRangeQuery might be constructed as follows: 
   String field = "field";
   long lowerValue = 0, long upperValue = 10;
   Query fallbackQuery = LongPoint.newRangeQuery(field, lowerValue, upperValue);
   Query rangeQuery = new IndexSortSortedNumericDocValuesRangeQuery(
       field, lowerValue, upperValue, fallbackQuery);

  • Field Details

    • field

      private final String field

    • lowerValue

      private final long lowerValue

    • upperValue

      private final long upperValue

    • fallbackQuery

      private final Query fallbackQuery

  • Constructor Details

    • IndexSortSortedNumericDocValuesRangeQuery

      public IndexSortSortedNumericDocValuesRangeQuery(String field, long lowerValue, long upperValue, Query fallbackQuery)
      Creates a new IndexSortSortedNumericDocValuesRangeQuery.
      Parameters:
      field - The field name.
      lowerValue - The lower end of the range (inclusive).
      upperValue - The upper end of the range (exclusive).
      fallbackQuery - A query to fall back to if the optimization cannot be applied.

  • Method Details

    • getFallbackQuery

      public Query getFallbackQuery()

    • equals

      public boolean equals(Object o)
      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:

    • visit

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

    • 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

    • 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.
      Overrides:
      rewrite in class Query
      Throws:
      IOException

    • createWeight

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

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

      Overrides:
      createWeight in class Query
      Parameters:
      scoreMode - How the produced scorers will be consumed.
      boost - The boost that is propagated by the parent queries.
      Throws:
      IOException

    • getDocIdSetIterator

      private DocIdSetIterator getDocIdSetIterator(SortField sortField, LeafReaderContext context, DocIdSetIterator delegate) throws IOException
      Computes the document IDs that lie within the range [lowerValue, upperValue] by performing binary search on the field's doc values. Because doc values only allow forward iteration, we need to reload the field comparator every time the binary search accesses an earlier element. We must also account for missing values when performing the binary search. For this reason, we load the FieldComparator instead of checking the docvalues directly. The returned DocIdSetIterator makes sure to wrap the original docvalues to skip over documents with no value.
      Throws:
      IOException

    • loadComparator

      private static IndexSortSortedNumericDocValuesRangeQuery.ValueComparator loadComparator(SortField sortField, long topValue, LeafReaderContext context) throws IOException
      Throws:
      IOException