Apache Pig - UPPER()

This function is used to convert all the characters in a string to uppercase.

Syntax

The syntax of the UPPER() function is as follows −

grunt> UPPER(expression)

Example

Assume that there is a file named emp.txt in the HDFS directory /pig_data/. This file contains the employee details such as id, name, age, and city.

emp.txt

001,Robin,22,newyork
002,BOB,23,Kolkata
003,Maya,23,Tokyo
004,Sara,25,London 
005,David,23,Bhuwaneshwar 
006,Maggy,22,Chennai
007,Robert,22,newyork
008,Syam,23,Kolkata
009,Mary,25,Tokyo
010,Saran,25,London 
011,Stacy,25,Bhuwaneshwar 
012,Kelly,22,Chennai 

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

grunt> emp_data = LOAD 'hdfs://localhost:9000/pig_data/emp.txt' USING PigStorage(',')
   as (id:int, name:chararray, age:int, city:chararray);

Given below is an example of the UPPER() function. In this example, we have converted the names of all the employees to upper case.

grunt> upper_data = FOREACH emp_data GENERATE (id,name), UPPER(name);

The above statement converts the names of all the employees to uppercase and returns the result.

The result of the statement will be stored in a relation named upper_data. Verify the content of the relation upper_data, using the Dump operator as shown below.

grunt> Dump upper_data;
  
((1,Robin),ROBIN)
((2,BOB),BOB)
((3,Maya),MAYA)
((4,Sara),SARA)
((5,David),DAVID)
((6,Maggy),MAGGY)
((7,Robert),ROBERT)
((8,Syam),SYAM)
((9,Mary),MARY)
((10,Saran),SARAN)
((11,Stacy),STACY)
((12,Kelly),KELLY)