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Posted to dev@hive.apache.org by "Sun Rui (JIRA)" <ji...@apache.org> on 2012/12/12 05:01:23 UTC
[jira] [Commented] (HIVE-3790) UDF to introduce an OFFSET(day,month
or year) for a given date or timestamp
[ https://issues.apache.org/jira/browse/HIVE-3790?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13529609#comment-13529609 ]
Sun Rui commented on HIVE-3790:
-------------------------------
Have you considered adding support to the SQL interval type? So, for example, if you want to add '1 year 3 month' to a date, you don't have to have two calls, first is to call date1=date_offset(date, 1, 'YEAR'), then to call date_offset (date1,3, 'MONTH').
> UDF to introduce an OFFSET(day,month or year) for a given date or timestamp
> ----------------------------------------------------------------------------
>
> Key: HIVE-3790
> URL: https://issues.apache.org/jira/browse/HIVE-3790
> Project: Hive
> Issue Type: New Feature
> Components: UDF
> Affects Versions: 0.9.0
> Reporter: Jithin John
>
> Current releases of Hive lacks a generic function which would find the date offset to a date / timestamp. Current releases have date_add (date) and date_sub(date) which allows user to add or substract days only.But we could not use year or month as a unit.
>
> The Function DATE_OFFSET(date,offset,unit) returns the date offset value from start_date according to the unit. Here the unit can be year , month and day.
> The function could be used for date range queries and is more flexible than the existing functions.
> Functionality :-
> Function Name: DATE_OFFSET(date,offset,unit)
>
> Add a offset value to the unit part of the date/timestamp.
> Returns the date in the format of "yyyy-MM-dd" .
> Example: hive> select date_offset('2009-07-29', -1 ,'MONTH' ) FROM src LIMIT 1
> -> 2009-06-29
> Usage :-
> Case : To calculate the expiry date of a item from manufacturing date
> Table :- ITEM_TAB
> Manufacturing_date |item id|store id |value|unit|price
> 2012-12-01|110001|0011111111003|0.99|1.00|0.99
> 2012-12-02|110001|0011111111008|0.99|0.00|0.00
> 2012-12-03|110001|0011111111009|0.99|0.00|0.00
> 2012-12-04|110001|0011111112002|0.99|0.00|0.00
> 2012-12-05|110001|0011111112003|0.99|0.00|0.00
> 2012-12-06|110001|0011111112006|0.99|1.00|0.99
> 2012-12-07|110001|0011111112007|0.99|0.00|0.00
> 2012-12-08|110001|0011111112008|0.99|0.00|0.00
> 2012-12-09|110001|0011111112009|0.99|0.00|0.00
> 2012-12-10|110001|0011111112010|0.99|0.00|0.00
> 2012-12-11|110001|0011111113003|0.99|0.00|0.00
> 2012-12-12|110001|0011111113006|0.99|0.00|0.00
> 2012-12-13|110001|0011111113008|0.99|0.00|0.00
> 2012-12-14|110001|0011111113010|0.99|0.00|0.00
> 2012-12-15|110001|0011111114002|0.99|0.00|0.00
> 2012-12-16|110001|0011111114004|0.99|1.00|0.99
> 2012-12-17|110001|0011111114005|0.99|0.00|0.00
> 2012-12-18|110001|0011111121004|0.99|0.00|0.00
> QUERY:
> select man_date , date_offset(man_date ,5 ,'year') as expiry_date from item_tab;
> RESULT:
> 2012-12-01 2017-12-01
> 2012-12-02 2017-12-02
> 2012-12-03 2017-12-03
> 2012-12-04 2017-12-04
> 2012-12-05 2017-12-05
> 2012-12-06 2017-12-06
> 2012-12-07 2017-12-07
> 2012-12-08 2017-12-08
> 2012-12-09 2017-12-09
> 2012-12-10 2017-12-10
> 2012-12-11 2017-12-11
> 2012-12-12 2017-12-12
> 2012-12-13 2017-12-13
> 2012-12-14 2017-12-14
> 2012-12-15 2017-12-15
> 2012-12-16 2017-12-16
> 2012-12-17 2017-12-17
> 2012-12-18 2017-12-18
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