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Apache Pig - AddDuration()
This function accepts a date-time object and a duration objects, and adds the given duration to the date-time object and returns a new date-time object with added duration.
Here is the syntax of the AddDuration() function.
grunt> AddDuration(datetime, duration)
Note − The Duration is represented in ISO 8601 standard. According to ISO 8601 standard P is placed at the beginning, while representing the duration and it is called as duration designator. Likewise,
Y is the year designator. We use this after declaring the year.
Example − P1Y represents 1 year.
M is the month designator. We use this after declaring the month.
Example − P1M represents 1 month.
W is the week designator. We use this after declaring the week.
Example − P1W represents 1 week.
D is the day designator. We use this after declaring the day.
Example − P1D represents 1 day.
T is the time designator. We use this before declaring the time.
Example − PT5H represents 5 hours.
H is the hour designator. We use this after declaring the hour.
Example − PT1H represents 1 hour.
M is the minute designator. We use this after declaring the minute.
Example − PT1M represents 1 minute.
S is the second designator. We use this after declaring the second.
Example − PT1S represents 1 second.
Assume that there is a file named date.txt in the HDFS directory /pig_data/. This file contains the date-of-birth details of a particular person, id, date and time and some duration according to ISO 8601 standard.
001,1989/09/26 09:00:00,PT1M 002,1980/06/20 10:22:00,P1Y 003,1990/12/19 03:11:44,P3M
And, we have loaded this file into Pig with a relation named date_duration as shown below.
grunt> date_duration = LOAD 'hdfs://localhost:9000/pig_data/date.txt' USING PigStorage(',') as (id:int, date:chararray, duration:chararray)
Following is an example of the AddDuration() function. You can add certain Duration to the given date-time object using this method as shown below.
grunt> Add_duration_data = foreach date_duration generate(date,duration), AddDuration(ToDate(date,'yyyy/MM/dd HH:mm:ss'), duration);
The result of the statement will be stored in the relation named add_duration_data. Verify the content of this relation using the Dump operator as shown below.
grunt> Dump add_duration_data; ((1989/09/26 09:00:00,PT1M),1989-09-26 T09:01:00.000+05:30) ((1980/06/20 10:22:00,P1Y),1981-06-20 T10:22:00.000+05:30) ((1990/12/19 03:11:44,P3M),1991-03-19 T03:11:44.000+05:30)