Package org.apache.lucene.search.join
Class ToParentBlockJoinQuery
java.lang.Object
org.apache.lucene.search.Query
org.apache.lucene.search.join.ToParentBlockJoinQuery
This query requires that you index children and parent docs as a single block, using the
IndexWriter.addDocuments() or IndexWriter.updateDocuments() API. In each block, the child documents must appear first, ending
with the parent document. At search time you provide a Filter identifying the parents, however
this Filter must provide an BitSet per sub-reader.
Once the block index is built, use this query to wrap any sub-query matching only child docs and join matches in that child document space up to the parent document space. You can then use this Query as a clause with other queries in the parent document space.
See ToChildBlockJoinQuery if you need to join in the reverse order.
The child documents must be orthogonal to the parent documents: the wrapped child query must never return a parent document.
See org.apache.lucene.search.join for an overview.
- WARNING: This API is experimental and might change in incompatible ways in the next release.
-
Constructor Summary
ConstructorsConstructorDescriptionToParentBlockJoinQuery(Query childQuery, BitSetProducer parentsFilter, ScoreMode scoreMode) Create a ToParentBlockJoinQuery. -
Method Summary
Modifier and TypeMethodDescriptioncreateWeight(IndexSearcher searcher, ScoreMode weightScoreMode, float boost) booleanReturn our child query.inthashCode()rewrite(IndexSearcher indexSearcher) voidvisit(QueryVisitor visitor) Methods inherited from class org.apache.lucene.search.Query
classHash, sameClassAs, toString
-
Constructor Details
-
ToParentBlockJoinQuery
Create a ToParentBlockJoinQuery.- Parameters:
childQuery- Query matching child documents.parentsFilter- Filter identifying the parent documents.scoreMode- How to aggregate multiple child scores into a single parent score.
-
-
Method Details
-
visit
-
createWeight
public Weight createWeight(IndexSearcher searcher, ScoreMode weightScoreMode, float boost) throws IOException - Overrides:
createWeightin classQuery- Throws:
IOException
-
getChildQuery
Return our child query. -
rewrite
- Overrides:
rewritein classQuery- Throws:
IOException
-
toString
-
equals
-
hashCode
public int hashCode()
-