Class OrdFieldSource

Expert: obtains the ordinal of the field value from the default Lucene FieldCache 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")=3

WARNING: 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: The status of the Search.Function package is experimental. The APIs introduced here might change in the future and will not be supported anymore in such a case.

NOTE: with the switch in 2.9 to segment-based searching, if GetValues(IndexReader) is invoked with a composite (multi-segment) reader, this can easily cause double RAM usage for the values in the FieldCache. It's best to switch your application to pass only atomic (single segment) readers to this API.

Inheritance
System.Object
ValueSource
OrdFieldSource
Inherited Members
Namespace:
Assembly: Lucene.Net.NetCore.dll
Syntax
public class OrdFieldSource : ValueSource

Constructors

Name Description
OrdFieldSource(String)

Constructor for a certain field.

Fields

Name Description
field

Methods

Name Description
Description()
Equals(Object)
GetHashCode()
GetValues(IndexReader)