Package org.apache.lucene.search
Class FieldExistsQuery
java.lang.Object
org.apache.lucene.search.Query
org.apache.lucene.search.FieldExistsQuery
A
Query that matches documents that contain either a KnnFloatVectorField, KnnByteVectorField or a field that indexes norms or doc values.-
Constructor Summary
ConstructorsConstructorDescriptionFieldExistsQuery(String field) Create a query that will match that have a value for the givenfield. -
Method Summary
Modifier and TypeMethodDescriptioncreateWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost) Expert: Constructs an appropriate Weight implementation for this query.booleanOverride and implement query instance equivalence properly in a subclass.static DocIdSetIteratorgetDocValuesDocIdSetIterator(String field, LeafReader reader) Returns aDocIdSetIteratorfrom the given field or null if the field doesn't exist in the reader or if the reader has no doc values for the field.getField()inthashCode()Override and implement query hash code properly in a subclass.rewrite(IndexSearcher indexSearcher) Expert: called to re-write queries into primitive queries.Prints a query to a string, withfieldassumed to be the default field and omitted.voidvisit(QueryVisitor visitor) Recurse through the query tree, visiting any child queries.Methods inherited from class org.apache.lucene.search.Query
classHash, sameClassAs, toString
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Constructor Details
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FieldExistsQuery
Create a query that will match that have a value for the givenfield.
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Method Details
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getDocValuesDocIdSetIterator
public static DocIdSetIterator getDocValuesDocIdSetIterator(String field, LeafReader reader) throws IOException Returns aDocIdSetIteratorfrom the given field or null if the field doesn't exist in the reader or if the reader has no doc values for the field.- Throws:
IOException
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getField
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toString
Description copied from class:QueryPrints a query to a string, withfieldassumed to be the default field and omitted. -
visit
Description copied from class:QueryRecurse through the query tree, visiting any child queries. -
equals
Description copied from class:QueryOverride and implement query instance equivalence properly in a subclass. This is required so thatQueryCacheworks properly.Typically a query will be equal to another only if it's an instance of the same class and its document-filtering properties are identical to those of the other instance. Utility methods are provided for certain repetitive code.
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hashCode
public int hashCode()Description copied from class:QueryOverride and implement query hash code properly in a subclass. This is required so thatQueryCacheworks properly. -
rewrite
Description copied from class:QueryExpert: called to re-write queries into primitive queries. For example, a PrefixQuery will be rewritten into a BooleanQuery that consists of TermQuerys.Callers are expected to call
rewritemultiple times if necessary, until the rewritten query is the same as the original query.The rewrite process may be able to make use of IndexSearcher's executor and be executed in parallel if the executor is provided.
- Overrides:
rewritein classQuery- Throws:
IOException- See Also:
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createWeight
Description copied from class:QueryExpert: Constructs an appropriate Weight implementation for this query.Only implemented by primitive queries, which re-write to themselves.
- Overrides:
createWeightin classQuery- Parameters:
scoreMode- How the produced scorers will be consumed.boost- The boost that is propagated by the parent queries.
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