Apache Pig - FLOOR()

The FLOOR() function is used to calculate the value of an expression rounded down to the nearest integer Here is the syntax of the FLOOR() function.

grunt> FLOOR(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.tx

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);

Now, let’s calculate the floor values of the contents of the math.txt file using FLOOR() as shown below.

grunt> floor_data = foreach math_data generate (data), FLOOR(data); 

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

grunt> Dump floor_data;
  
(5.0,5.0) 
(16.0,16.0) 
(9.0,9.0) 
(2.5,2.0) 
(5.9,5.0) 
(3.1,3.0)