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What is LOG10() function?

  • Log10 computes the common (base 10) log of its argument x .
  • The x argument must be a positive double-precision, floating-point number.
  • Log10 returns the common log of its argument, expressed as a double-precision, floating-point number.
 Apache Pig Log10

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LOG10() function in Apache Pig

  • The LOG10() function of Pig Latin is used to calculate the natural logarithm base 10 value of a given expression.


grunt> LOG10(expression)


  • Ensure that you have a file named wikitechy_math.txt in the HDFS directory /pig_data/.
  • This file contains integer and floating point values as given below.


  • You have loaded this file into Pig with a relation named math_data as given below.
grunt> math_data = LOAD 'hdfs://localhost:9000/pig_data/wikitechy_math.txt' USING PigStorage(',')
   as (data:float);
  • Now you can calculate the log10 values of the contents of the wikitechy_math.txt file using LOG10() function as given below.
grunt> log_data = foreach math_data generate (data),LOG10(data);


  • Verify the contents of the relation using the Dump operator as given below.
grunt> Dump log10_data;


  • The above statement stores the result in the relation named log_data.

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