Class OrdFieldSource
- java.lang.Object
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- org.apache.lucene.queries.function.ValueSource
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- org.apache.lucene.queries.function.valuesource.OrdFieldSource
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public class OrdFieldSource extends ValueSource
Obtains the ordinal of the field value from the default LuceneFieldCache
using getStringIndex().
The native lucene index order is used to assign an ordinal value for each field value.
Field values (terms) are lexicographically ordered by unicode value, and numbered starting at 1.
Example:
If there were only three field values: "apple","banana","pear"
then ord("apple")=1, ord("banana")=2, ord("pear")=3WARNING: ord() depends on the position in an index and can thus change when other documents are inserted or deleted, or if a MultiSearcher is used.
WARNING: as of Solr 1.4, ord() and rord() can cause excess memory use since they must use a FieldCache entry at the top level reader, while sorting and function queries now use entries at the segment level. Hence sorting or using a different function query, in addition to ord()/rord() will double memory use.
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Constructor Summary
Constructors Constructor Description OrdFieldSource(java.lang.String field)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.String
description()
description of field, used in explain()boolean
equals(java.lang.Object o)
FunctionValues
getValues(java.util.Map context, AtomicReaderContext readerContext)
Gets the values for this reader and the context that was previously passed to createWeight()int
hashCode()
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Methods inherited from class org.apache.lucene.queries.function.ValueSource
createWeight, getSortField, newContext, toString
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Method Detail
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description
public java.lang.String description()
Description copied from class:ValueSource
description of field, used in explain()- Specified by:
description
in classValueSource
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getValues
public FunctionValues getValues(java.util.Map context, AtomicReaderContext readerContext) throws java.io.IOException
Description copied from class:ValueSource
Gets the values for this reader and the context that was previously passed to createWeight()- Specified by:
getValues
in classValueSource
- Throws:
java.io.IOException
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equals
public boolean equals(java.lang.Object o)
- Specified by:
equals
in classValueSource
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hashCode
public int hashCode()
- Specified by:
hashCode
in classValueSource
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