public class ToParentBlockJoinQuery extends 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 |
---|
ToParentBlockJoinQuery(Query childQuery,
BitSetProducer parentsFilter,
ScoreMode scoreMode)
Create a ToParentBlockJoinQuery.
|
Modifier and Type | Method and Description |
---|---|
Weight |
createWeight(IndexSearcher searcher,
ScoreMode weightScoreMode,
float boost) |
boolean |
equals(Object other) |
Query |
getChildQuery()
Return our child query.
|
int |
hashCode() |
Query |
rewrite(IndexReader reader) |
String |
toString(String field) |
classHash, sameClassAs, toString
public ToParentBlockJoinQuery(Query childQuery, BitSetProducer parentsFilter, 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 Weight createWeight(IndexSearcher searcher, ScoreMode weightScoreMode, float boost) throws IOException
createWeight
in class Query
IOException
public Query getChildQuery()
public Query rewrite(IndexReader reader) throws IOException
rewrite
in class Query
IOException
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