org.apache.hadoop.hive.ql.udf

Class UDFMath

java.lang.Object

org.apache.hadoop.hive.ql.exec.UDF

org.apache.hadoop.hive.ql.udf.UDFMath

Direct Known Subclasses:

UDFAcos, UDFAsin, UDFAtan, UDFCos, UDFDegrees, UDFExp, UDFLn, UDFLog, UDFLog10, UDFLog2, UDFRadians, UDFSin, UDFSqrt, UDFTan

public abstract class UDFMath
extends UDF

This class can be used for math based UDFs that only have an evaluate method for doubles. By extending from this class these UDFs will automatically support decimals as well.

Constructor Summary

Constructors

Constructor and Description
UDFMath()

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract DoubleWritable	doEvaluate(DoubleWritable a) For subclass to implement.
DoubleWritable	evaluate(DoubleWritable a) Returns null if the passed in value is and passes on to doEvaluate(DoubleWritable) if not.
DoubleWritable	evaluate(HiveDecimalWritable writable) Convert HiveDecimal to a double and call evaluate() on it.

Methods inherited from class org.apache.hadoop.hive.ql.exec.UDF

getRequiredFiles, getRequiredJars, getResolver, setResolver

Methods inherited from class java.lang.Object

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

Constructor Detail

UDFMath

public UDFMath()

Method Detail

doEvaluate

protected abstract DoubleWritable doEvaluate(DoubleWritable a)

For subclass to implement.

evaluate

public final DoubleWritable evaluate(DoubleWritable a)

Returns null if the passed in value is and passes on to doEvaluate(DoubleWritable) if not.

evaluate

public final DoubleWritable evaluate(HiveDecimalWritable writable)

Convert HiveDecimal to a double and call evaluate() on it.