org.apache.pig.data

Interface TupleRawComparator

All Superinterfaces:

Comparator, org.apache.hadoop.conf.Configurable, org.apache.hadoop.io.RawComparator

All Known Implementing Classes:

BinInterSedes.BinInterSedesTupleRawComparator, DefaultTuple.DefaultTupleRawComparator, PigTupleDefaultRawComparator

@InterfaceAudience.Public
@InterfaceStability.Evolving
public interface TupleRawComparator
extends org.apache.hadoop.io.RawComparator, org.apache.hadoop.conf.Configurable

This interface is intended to compare Tuples. The semantics of Tuple comparison must take into account null values in different ways. According to SQL semantics nulls are not equal. But for other Pig/Latin statements nulls must be grouped together. This interface allows to check if there are null fields in the tuples compared using this comparator. This method is meaningful only when the tuples are determined to be equal by the RawComparator.compare(byte[],int,int,byte[],int,int) method.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	hasComparedTupleNull() Checks if one of the compared tuples had a null field.

Methods inherited from interface org.apache.hadoop.io.RawComparator

compare

Methods inherited from interface java.util.Comparator

compare, equals

Methods inherited from interface org.apache.hadoop.conf.Configurable

getConf, setConf

Method Detail

hasComparedTupleNull

boolean hasComparedTupleNull()

Checks if one of the compared tuples had a null field. This method is meaningful only when RawComparator.compare(byte[],int,int,byte[],int,int) has returned a zero value (i.e. tuples are determined to be equal).

Returns:

true if one of the compared tuples had a null field, false otherwise.