Apache Pig - UCFIRST()

This function accepts a string, converts the first letter of it into uppercase, and returns the result.

Syntax

Here is the syntax of the function UCFIRST() function.

grunt> UCFIRST(expression) 

Example

Assume that there is a file named emp.txt in the HDFS directory /pig_data/ as shown below. 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);

Following is an example of the UCFIRST() function. In this example, we are trying to convert the first letters of the names of the cities, to which the employees belong to, to uppercase.

grunt> ucfirst_data = FOREACH emp_data GENERATE (id,city), UCFIRST(city);

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

In our example, the first letter of the name of the city “newyork” is in lowercase. After applying UCFIRST() function, it turns into “NEWYORK”

grunt>Dump ucfirst_data;
  
((1,newyork),Newyork) 
((2,Kolkata),Kolkata)
((3,Tokyo),Tokyo) 
((4,London),London) 
((5,Bhuwaneshwar),Bhuwaneshwar) 
((6,Chennai),Chennai) 
((7,newyork),Newyork) 
((8,Kolkata),Kolkata)
((9,Tokyo),Tokyo) 
((10,London),London) 
((11,Bhuwaneshwar),Bhuwaneshwar) 
((12,Chennai),Chennai)