Class ParentChildrenBlockJoinQuery


  • public class ParentChildrenBlockJoinQuery
    extends Query
    A query that returns all the matching child documents for a specific parent document indexed together in the same block. The provided child query determines which matching child doc is being returned.
    • Field Detail

      • childQuery

        private final Query childQuery
      • parentDocId

        private final int parentDocId
    • Constructor Detail

      • ParentChildrenBlockJoinQuery

        public ParentChildrenBlockJoinQuery​(BitSetProducer parentFilter,
                                            Query childQuery,
                                            int parentDocId)
        Creates a ParentChildrenBlockJoinQuery instance
        Parameters:
        parentFilter - A filter identifying parent documents.
        childQuery - A child query that determines which child docs are matching
        parentDocId - The top level doc id of that parent to return children documents for
    • Method Detail

      • equals

        public boolean equals​(java.lang.Object obj)
        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:
        Query.sameClassAs(Object), Query.classHash()
      • 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:
        Query.equals(Object)
      • toString

        public java.lang.String toString​(java.lang.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
        Overrides:
        visit in class Query
        Parameters:
        visitor - a QueryVisitor to be called by each query in the tree
      • rewrite

        public Query rewrite​(IndexReader reader)
                      throws java.io.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:
        java.io.IOException
      • createWeight

        public Weight createWeight​(IndexSearcher searcher,
                                   ScoreMode scoreMode,
                                   float boost)
                            throws java.io.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
        scoreMode - How the produced scorers will be consumed.
        boost - The boost that is propagated by the parent queries.
        Throws:
        java.io.IOException