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https://issues.apache.org/jira/browse/HIVE-3299?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13422156#comment-13422156
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shalish commented on HIVE-3299:
-------------------------------
Current releases of Hive lacks a function which would return the day name
corresponding to a date / timestamp value which might be a part of a column.
The function -DAYNAME (date) would return the day name from a date / timestamp
or column which would be useful while using HiveQL. This would find its use in
various business sectors like retail, which would help in identifying the
trends and sales datails for a particular weekday for entire year,month or week.
Functionality :-
Function Name: DAYNAME (date)
Returns the name of the weekday for date.
Example: hive> SELECT DAYNAME('2012-07-25');
-> 'Wednesday'
Usage :-
Case 1 : To find DAY NAME corresponding to a particular date
hive> SELECT DAYNAME('2012-07-25');
-> 'Wednesday'
Case 2 : To query a table to find details based on a particular day name
Table :-
date |item id|store id |value|unit|price
01/07/2012|110001|0011111111003|0.99|1.00|0.99
02/07/2012|110001|0011111111008|0.99|0.00|0.00
03/07/2012|110001|0011111111009|0.99|0.00|0.00
04/07/2012|110001|0011111112002|0.99|0.00|0.00
05/07/2012|110001|0011111112003|0.99|0.00|0.00
06/07/2012|110001|0011111112006|0.99|1.00|0.99
07/07/2012|110001|0011111112007|0.99|0.00|0.00
08/07/2012|110001|0011111112008|0.99|0.00|0.00
09/07/2012|110001|0011111112009|0.99|0.00|0.00
10/07/2012|110001|0011111112010|0.99|0.00|0.00
11/07/2012|110001|0011111113003|0.99|0.00|0.00
12/07/2012|110001|0011111113006|0.99|0.00|0.00
13/07/2012|110001|0011111113008|0.99|0.00|0.00
14/07/2012|110001|0011111113010|0.99|0.00|0.00
15/07/2012|110001|0011111114002|0.99|0.00|0.00
16/07/2012|110001|0011111114004|0.99|1.00|0.99
17/07/2012|110001|0011111114005|0.99|0.00|0.00
18/07/2012|110001|0011111121004|0.99|0.00|0.00
Query : select * from sales where dayname(date)='wednesday';
Result :-
04/07/2012|110001|0011111112002|0.99|0.00|0.00
11/07/2012|110001|0011111113003|0.99|0.00|0.00
18/07/2012|110001|0011111121004|0.99|0.00|0.00
> UDF DAYNAME(date) to HIVE
> ---------------------------
>
> Key: HIVE-3299
> URL: https://issues.apache.org/jira/browse/HIVE-3299
> Project: Hive
> Issue Type: New Feature
> Components: UDF
> Affects Versions: 0.9.0
> Reporter: Namitha Babychan
> Fix For: 0.10.0
>
>
> Function Name: DAYNAME (date)
>
> Returns the name of the weekday for date.
> Example: hive> SELECT DAYNAME('2012-07-25');
> -> 'Wednesday'
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