org.apache.hadoop.hive.ql.udf
Class UDFLog

java.lang.Object
  org.apache.hadoop.hive.ql.exec.UDF
      org.apache.hadoop.hive.ql.udf.UDFMath
          org.apache.hadoop.hive.ql.udf.UDFLog

public class UDFLog
extends UDFMath

UDFLog.

Constructor Summary

UDFLog()

Method Summary

DoubleWritable	evaluate(DoubleWritable a) Returns the natural logarithm of "a".
DoubleWritable	evaluate(DoubleWritable base, DoubleWritable a) Returns the logarithm of "a" with base "base".
DoubleWritable	evaluate(DoubleWritable base, HiveDecimalWritable writable) Get the logarithm of the given decimal with the given base.
DoubleWritable	evaluate(HiveDecimalWritable base, DoubleWritable d) Get the logarithm of input with the given decimal as the base.
DoubleWritable	evaluate(HiveDecimalWritable baseWritable, HiveDecimalWritable writable) Get the logarithm of the given decimal input with the given decimal base.

Methods inherited from class org.apache.hadoop.hive.ql.udf.UDFMath

evaluate

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

getRequiredFiles, getRequiredJars, getResolver, setResolver

Methods inherited from class java.lang.Object

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

Constructor Detail

UDFLog

public UDFLog()

Method Detail

evaluate

public DoubleWritable evaluate(DoubleWritable a)

Returns the natural logarithm of "a".

Specified by:

evaluate in class UDFMath

evaluate

public DoubleWritable evaluate(DoubleWritable base,
                               DoubleWritable a)

Returns the logarithm of "a" with base "base".

evaluate

public DoubleWritable evaluate(DoubleWritable base,
                               HiveDecimalWritable writable)

Get the logarithm of the given decimal with the given base.

evaluate

public DoubleWritable evaluate(HiveDecimalWritable base,
                               DoubleWritable d)

Get the logarithm of input with the given decimal as the base.

evaluate

public DoubleWritable evaluate(HiveDecimalWritable baseWritable,
                               HiveDecimalWritable writable)

Get the logarithm of the given decimal input with the given decimal base.