Apache Pig Split operator

The SPLIT operator is used to split a relationship into two or more relationships.

Grammar

The syntax of the SPLIT operator is given below.

grunt> SPLIT Relation1_name INTO Relation2_name IF (condition1), Relation2_name (condition2),

Cases

Suppose you have a file called pig_data in the HDFS directory /student_details.txt, as shown below.

student_details.txt

001,Rajiv,Reddy,21,9848022337,Hyderabad
002,siddarth,Battacharya,22,9848022338,Kolkata
003,Rajesh,Khanna,22,9848022339,Delhi 
004,Preethi,Agarwal,21,9848022330,Pune 
005,Trupthi,Mohanthy,23,9848022336,Bhuwaneshwar 
006,Archana,Mishra,23,9848022335,Chennai 
007,Komal,Nayak,24,9848022334,trivendram 
008,Bharathi,Nambiayar,24,9848022333,Chennai

The relationship student_details load this file into Pig, as shown below.

student_details = LOAD 'hdfs://localhost:9000/pig_data/student_details.txt' USING PigStorage(',')
   as (id:int, firstname:chararray, lastname:chararray, age:int, phone:chararray, city:chararray); 

Now, let's divide the relationship into two, one listing employees under the age of 23 and the other between the ages of 22 and 25.

SPLIT student_details into student_details1 if age<23, student_details2 if (22<age and age>25);

Verify

Use the DUMP operator to verify relationships student_details1 and student_details2, as shown below.

grunt> Dump student_details1;  

grunt> Dump student_details2; 

Output

It produces the following output, which shows the relationship student_details1 and student_details2 content, respectively.

grunt> Dump student_details1; 
(1,Rajiv,Reddy,21,9848022337,Hyderabad) 
(2,siddarth,Battacharya,22,9848022338,Kolkata)
(3,Rajesh,Khanna,22,9848022339,Delhi) 
(4,Preethi,Agarwal,21,9848022330,Pune)
  
grunt> Dump student_details2; 
(5,Trupthi,Mohanthy,23,9848022336,Bhuwaneshwar) 
(6,Archana,Mishra,23,9848022335,Chennai) 
(7,Komal,Nayak,24,9848022334,trivendram) 
(8,Bharathi,Nambiayar,24,9848022333,Chennai)