https://www.tutorialspoint.com/apache\_pig/apache\_pig\_limit\_operator.htm
The LIMIT operator is used to get a limited number of tuples from a relation.
Syntax
Given below is the syntax of the LIMIT operator.
grunt> Result = LIMIT Relation_name required number of tuples;
Example
Assume that we have a file named student_details.txt in the HDFS directory /pig_data/ 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
And we have loaded this file into Pig with the relation name student_details as shown below.
grunt> 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 sort the relation in descending order based on the age of the student and store it into another relation named limit_data using the ORDER BY operator as shown below.
grunt> limit_data = LIMIT student_details 4;
Verification
Verify the relation limit_data using the DUMP operator as shown below.
grunt> Dump limit_data;
Output
It will produce the following output, displaying the contents of the relation limit_data as follows.
(1,Rajiv,Reddy,21,9848022337,Hyderabad)
(2,siddarth,Battacharya,22,9848022338,Kolkata)
(3,Rajesh,Khanna,22,9848022339,Delhi)
(4,Preethi,Agarwal,21,9848022330,Pune)