pig tutorial - apache pig tutorial - Apache Pig LCFIRST() - pig latin - apache pig - pig hadoop

What is LCFIRST?

  • This function is used to covert the first character of the given string into lowercase.


  • Following is the syntax of the LCFIRST() function.
grunt> LCFIRST(expression) 


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


003,Charu,23, London
005, Hansa,22,Bhuwaneshwar 
006, Hena,21,Chennai
007,Robert,24, Bhuwaneshwar
009,Leena,22, Chennai
010,Mahi,22, newyork
011,Priya,23, Tokyo
012,Rahul,20, newyork
  • And, we have loaded this file into Pig with a relation named wikitechy_emp_data as shown below.
grunt> wikitechy_emp_data = LOAD 'hdfs://localhost:9000/pig_data/wikitechy_emp.txt' USING PigStorage(',')
   as (id:int, name:chararray, age:int, city:chararray);
  • Given below is an example of the LCFIRST() function. In this example, we have converted all the first letters of the names of the employees to lowercase.
grunt> Lcfirst_data = FOREACH wikitechy_emp_data GENERATE (id,name), LCFIRST(name);
  • The result of the statement will be stored in the relation named Lcfirst_data. Verify the content of the relation Lcfirst_data, using the Dump operator as shown below.
grunt> Dump Lcfirst_data;
  • ((1,Aadav),aadav)
  • ((2,Aadhi),aadhi)
  • ((3,Charu),charu)
  • ((4,Daya),daya)
  • ((5,Hansa),hansa)
  • ((6,Hena),hena)
  • ((7,Robert),robert)
  • ((8,Kali),kali)
  • ((9,Leena),leena)
  • ((10,Mahi),mahi)
  • ((11,Priya),priya)
  • 12,Rahul,rahul

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