Apache Pig - ABS()


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The ABS() function of Pig Latin is used to calculate the absolute value of a given expression.

Syntax

Here is the syntax of the ABS() function.

grunt> ABS(expression)

Example

Assume that there is a file named math.txt in the HDFS directory /pig_data/. This file contains integer and floating point values as shown below.

math.txt

5 
16 
9 
2.5 
5.9 
3.1 

And, we have loaded this file into Pig with a relation named math_data as shown below.

grunt> math_data = LOAD 'hdfs://localhost:9000/pig_data/math.txt' USING PigStorage(',')
   as (data:float);

Let us calculate the absolute values of the contents of the math.txt file using ABS() as shown below.

grunt> abs_data = foreach math_data generate (data), ABS(data);

The above statement stores the result in the relation named abs_data. Verify the contents of the relation using the Dump operator as shown below.

grunt> Dump abs_data; 

(5.0,5.0) 
(16.0,16.0) 
(9.0,9.0) 
(2.5,2.5) 
(5.9,5.9) 
(3.1,3.1)
apache_pig_math_functions.htm
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