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Apache Pig - EqualsIgnoreCase()
The EqualsIgnoreCase() function is used to compare two strings and verify whether they are equal. If both are equal this function returns the Boolean value true else it returns the value false.
Syntax
Given below is the syntax of the function EqualsIgnoreCase()
grunt> EqualsIgnoreCase(string1, string2)
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);
Given below is an example of the EqualsIgnoreCase() function. In this example we are comparing the names of every employees with the string value ‘Robin’.
grunt> equals_data = FOREACH emp_data GENERATE (id,name), EqualsIgnoreCase(name, 'Robin');
The above statement compares the string “Robin” (case insensitive) with the names of the employees, if the value matches it returns true else it returns false. In short, this statement searches the employee record whose name is ‘Robin’
The result of the statement will be stored in the relation named equals_data. Verify the content of the relation equals_data, using the Dump operator as shown below.
grunt> Dump equals_data; ((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),false) ((11,Stacy),false) ((12,Kelly),false)