org.apache.pig
Class ComparisonFunc

java.lang.Object
  org.apache.hadoop.io.WritableComparator
      org.apache.pig.ComparisonFunc

All Implemented Interfaces:

Comparator, org.apache.hadoop.io.RawComparator

Deprecated.

@InterfaceAudience.Public
@InterfaceStability.Stable
@Deprecated
public abstract class ComparisonFunc
extends org.apache.hadoop.io.WritableComparator

An interface for custom order by comparator function.

Field Summary

protected PigProgressable

reporter Deprecated.

Constructor Summary

ComparisonFunc()
Deprecated.

Method Summary

abstract int	compare(Tuple t1, Tuple t2) Deprecated. This callback method must be implemented by all subclasses.
int	compare(org.apache.hadoop.io.WritableComparable a, org.apache.hadoop.io.WritableComparable b) Deprecated. Compare two tuples.
void	setReporter(PigProgressable reporter) Deprecated. Set the reporter.

Methods inherited from class org.apache.hadoop.io.WritableComparator

compare, compare, compareBytes, define, get, getKeyClass, hashBytes, hashBytes, newKey, readDouble, readFloat, readInt, readLong, readUnsignedShort, readVInt, readVLong

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Comparator

equals

Field Detail

reporter

protected PigProgressable reporter

Deprecated.

Constructor Detail

ComparisonFunc

public ComparisonFunc()

Deprecated.

Method Detail

compare

public int compare(org.apache.hadoop.io.WritableComparable a,
                   org.apache.hadoop.io.WritableComparable b)

Deprecated.

Compare two tuples. Note that even though both args are given type of WritableComparable to match the WritableComparable interface, they must both be tuples.

Overrides:

compare in class org.apache.hadoop.io.WritableComparator

Parameters:

a - first tuple

b - tuple to compare a to

Returns:

-1 if a < b, 1 if a > b, 0 if a = b

compare

public abstract int compare(Tuple t1,
                            Tuple t2)

Deprecated.

This callback method must be implemented by all subclasses. Compares its two arguments for order. The order of elements of the tuples correspond to the fields specified in the order by clause. Same semantics as Comparator.

Parameters:

t1 - the first Tuple to be compared.

t2 - the second Tuple to be compared.

Returns:

Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second.

Throws:

IOException

See Also:

Comparator

setReporter

public void setReporter(PigProgressable reporter)

Deprecated.

Set the reporter. If the comparison takes a long time the reporter should be called occasionally to avoid Hadoop timing out underneath. The default Hadoop timeout is 600 seconds.

Parameters:

reporter - Progress reporter