This function accepts a date-time object as a parameter and returns the current week year from the given date-time object.
Here is the syntax of the GetWeekYear() function.
Assume that there is a file named 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.
001,1989/09/26 09:00:00 002,1980/06/20 10:22:00 003,1990/12/19 03:11:44
And, we 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);
Following is an example of the GetWeekYear() function. It will retrive the current week year from the given date-time object. Therefore, let us 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; (1989-09-26T09:00:00.000+05:30) (1980-06-20T10:22:00.000+05:30) (1990-12-19T03:11:44.000+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);
Now verify the contents of the getweekyear_data relation using the Dump operator.
grunt> Dump getweekyear_data; (1989-09-26T09:00:00.000+05:30,1989) (1980-06-20T10:22:00.000+05:30,1980) (1990-12-19T03:11:44.000+05:30,1990)