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Apache Pig - ENDSWITH()
This function accepts two String parameters, it is used to verify whether the first string ends with the second string.
grunt> ENDSWITH(string1, string2)
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.
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 ENDSWITH() function, in this example we are verifying, weather the name of every employee ends with the character n.
grunt> emp_endswith = FOREACH emp_data GENERATE (id,name),ENDSWITH ( name, 'n' );
The above statement verifies weather the name of the employee ends with the letter n. Since the names of the employees Saran and Robin ends with the letter n for these two tuples ENDSWITH() function returns the Boolean value ‘true’ and for remaining tuples the value will be ‘false’.
The result of the statement will be stored in the relation named emp_endswith. Verify the content of the relation emp_endswith, using the Dump operator as shown below.
grunt> Dump emp_endswith; ((1,Robin),true) ((2,BOB),false) ((3,Maya),false) ((4,Sara),false) ((5,David),false) ((6,Maggy),false) ((7,Robert),false) ((8,Syam),false) ((9,Mary),false) ((10,Saran),true) ((11,Stacy),false) ((12,Kelly),false)