org.apache.lucene.search.join
Class ToChildBlockJoinQuery
java.lang.Object
org.apache.lucene.search.Query
org.apache.lucene.search.join.ToChildBlockJoinQuery
- All Implemented Interfaces:
- Serializable, Cloneable
public class ToChildBlockJoinQuery
- extends org.apache.lucene.search.Query
Just like ToParentBlockJoinQuery
, except this
query joins in reverse: you provide a Query matching
parent documents and it joins down to child
documents.
WARNING: to create the parents filter, always use
RawTermFilter
(so that the filter
includes deleted docs), wrapped with CachingWrapperFilter
(so that the returned bit set per
reader is a FixedBitSet
), specifying
DeletesMode.IGNORE (so that on reopen, the filter still
includes deleted docs). Failure to do this can result in
completely wrong documents being returned! For example:
Filter parents = new CachingWrapperFilter(
new RawTermFilter(new Term("parent", "yes")),
CachingWrapperFilter.DeletesMode.IGNORE);
- See Also:
- Serialized Form
- WARNING: This API is experimental and might change in incompatible ways in the next release.
Constructor Summary |
ToChildBlockJoinQuery(org.apache.lucene.search.Query parentQuery,
org.apache.lucene.search.Filter parentsFilter,
boolean doScores)
|
Methods inherited from class org.apache.lucene.search.Query |
combine, getBoost, getSimilarity, mergeBooleanQueries, setBoost, toString, weight |
ToChildBlockJoinQuery
public ToChildBlockJoinQuery(org.apache.lucene.search.Query parentQuery,
org.apache.lucene.search.Filter parentsFilter,
boolean doScores)
createWeight
public org.apache.lucene.search.Weight createWeight(org.apache.lucene.search.Searcher searcher)
throws IOException
- Overrides:
createWeight
in class org.apache.lucene.search.Query
- Throws:
IOException
extractTerms
public void extractTerms(Set<org.apache.lucene.index.Term> terms)
- Overrides:
extractTerms
in class org.apache.lucene.search.Query
rewrite
public org.apache.lucene.search.Query rewrite(org.apache.lucene.index.IndexReader reader)
throws IOException
- Overrides:
rewrite
in class org.apache.lucene.search.Query
- Throws:
IOException
toString
public String toString(String field)
- Specified by:
toString
in class org.apache.lucene.search.Query
equals
public boolean equals(Object _other)
- Overrides:
equals
in class org.apache.lucene.search.Query
hashCode
public int hashCode()
- Overrides:
hashCode
in class org.apache.lucene.search.Query
clone
public Object clone()
- Overrides:
clone
in class org.apache.lucene.search.Query
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