org.apache.lucene.search.function
public class OrdFieldSource extends ValueSource
Fieldcache
using getStringIndex().
The native lucene index order is used to assign an ordinal value for each field value.
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.
Field Summary | |
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protected String | field |
Constructor Summary | |
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OrdFieldSource(String field)
Contructor for a certain field. |
Method Summary | |
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String | description() |
boolean | equals(Object o) |
DocValues | getValues(IndexReader reader) |
int | hashCode() |
Parameters: field field whose values order is used.