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What is GetWeekYear() in Apache Pig ?

  • The GetWeekYear() function accepts a date-time object as a parameter and returns the current week year from the given date-time object.

Syntax:

grunt> GetWeekYear(datetime)

Example:

  • Ensure that you have a file named wikitechy_date.txt in the HDFS directory /pig_data/ as shown below.
  • This file contains the date-of-birth details of a particular person, id, date, and time.

wikitechy_date.txt

001,1996/10/4  03:11:44 
002,1980/06/20 10:22:00
003,1989/10/16 09:00:00
  • You have loaded this file into Pig with a relation named date_data as shown below.
grunt> date_data = LOAD 'hdfs://localhost:9000/pig_data/date.txt' USING PigStorage(',')
   as (id:int,date:chararray);
  • An example of the GetWeekYear() function.
  • It will retrive the current week year from the given date-time object.
  • Hence, we generate the date-time objects of all employees using todate() function as shown below.
grunt> todate_data = foreach date_data generate ToDate(date,'yyyy/MM/dd HH:mm:ss')
   as (date_time:DateTime );
  
grunt> Dump todate_data;
(1996/10/4  03:11:44 :.000+05:30)
(1980/06/20 10:22:00:.000+05:30)
(1989/10/16 09:00:00.000+05:30) 
  • Let us get the month from the date-of-birth of each employee using GetWeekYear() function and store it in the relation named getweekyear_data as shown below.
grunt> getweekyear_data = foreach todate_data generate (date_time), GetWeekYear(date_time);

Verification:

  • You have verify the contents of the getweekyear_data relation using the Dump operator.
grunt> Dump getweekyear_data;

Output:

(1996/10/4  03:11:44.000+05:30,1996) 
(1980/06/20 10:22:00.000+05:30,1980) 
(1989/10/16 09:00:00.000+05:30,1989) 


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