Package org.apache.lucene.search.join
Class ToChildBlockJoinQuery
- java.lang.Object
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- org.apache.lucene.search.Query
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- org.apache.lucene.search.join.ToChildBlockJoinQuery
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- All Implemented Interfaces:
Serializable
,Cloneable
public class ToChildBlockJoinQuery extends Query
Just likeToParentBlockJoinQuery
, 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 withCachingWrapperFilter
(so that the returned bit set per reader is aFixedBitSet
), 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.
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Constructor Summary
Constructors Constructor Description ToChildBlockJoinQuery(Query parentQuery, Filter parentsFilter, boolean doScores)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Object
clone()
Returns a clone of this query.Weight
createWeight(Searcher searcher)
Expert: Constructs an appropriate Weight implementation for this query.boolean
equals(Object _other)
void
extractTerms(Set<Term> terms)
Expert: adds all terms occurring in this query to the terms set.int
hashCode()
Query
rewrite(IndexReader reader)
Expert: called to re-write queries into primitive queries.String
toString(String field)
Prints a query to a string, withfield
assumed to be the default field and omitted.-
Methods inherited from class org.apache.lucene.search.Query
combine, getBoost, getSimilarity, mergeBooleanQueries, setBoost, toString, weight
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Method Detail
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createWeight
public Weight createWeight(Searcher searcher) throws 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 classQuery
- Throws:
IOException
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extractTerms
public void extractTerms(Set<Term> terms)
Description copied from class:Query
Expert: adds all terms occurring in this query to the terms set. Only works if this query is in itsrewritten
form.- Overrides:
extractTerms
in classQuery
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rewrite
public Query rewrite(IndexReader reader) throws 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 classQuery
- Throws:
IOException
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toString
public String toString(String field)
Description copied from class:Query
Prints a query to a string, withfield
assumed to be the default field and omitted.The representation used is one that is supposed to be readable by
QueryParser
. However, there are the following limitations:- If the query was created by the parser, the printed representation may not be exactly what was parsed. For example, characters that need to be escaped will be represented without the required backslash.
- Some of the more complicated queries (e.g. span queries) don't have a representation that can be parsed by QueryParser.
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