public class XToParentBlockJoinQuery
extends org.apache.lucene.search.Query
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.
Constructor and Description |
---|
XToParentBlockJoinQuery(org.apache.lucene.search.Query childQuery,
org.apache.lucene.search.join.BitSetProducer parentsFilter,
org.apache.lucene.search.join.ScoreMode scoreMode)
Create a ToParentBlockJoinQuery.
|
Modifier and Type | Method and Description |
---|---|
org.apache.lucene.search.Weight |
createWeight(org.apache.lucene.search.IndexSearcher searcher,
boolean needsScores) |
boolean |
equals(java.lang.Object other) |
org.apache.lucene.search.Query |
getChildQuery()
Return our child query.
|
int |
hashCode() |
org.apache.lucene.search.Query |
rewrite(org.apache.lucene.index.IndexReader reader) |
java.lang.String |
toString(java.lang.String field) |
public XToParentBlockJoinQuery(org.apache.lucene.search.Query childQuery, org.apache.lucene.search.join.BitSetProducer parentsFilter, org.apache.lucene.search.join.ScoreMode scoreMode)
childQuery
- Query matching child documents.parentsFilter
- Filter identifying the parent documents.scoreMode
- How to aggregate multiple child scores
into a single parent score.public org.apache.lucene.search.Weight createWeight(org.apache.lucene.search.IndexSearcher searcher, boolean needsScores) throws java.io.IOException
createWeight
in class org.apache.lucene.search.Query
java.io.IOException
public org.apache.lucene.search.Query getChildQuery()
public org.apache.lucene.search.Query rewrite(org.apache.lucene.index.IndexReader reader) throws java.io.IOException
rewrite
in class org.apache.lucene.search.Query
java.io.IOException
public java.lang.String toString(java.lang.String field)
toString
in class org.apache.lucene.search.Query
public boolean equals(java.lang.Object other)
equals
in class org.apache.lucene.search.Query
public int hashCode()
hashCode
in class org.apache.lucene.search.Query