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https://issues.apache.org/jira/browse/HIVE-9472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14292607#comment-14292607
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Xiaobing Zhou commented on HIVE-9472:
-------------------------------------
Checked trunk, there's a UDF 'last_day' already supported.
> Implement 7 simple UDFs added to Hive
> -------------------------------------
>
> Key: HIVE-9472
> URL: https://issues.apache.org/jira/browse/HIVE-9472
> Project: Hive
> Issue Type: Bug
> Components: UDF
> Affects Versions: 0.14.0
> Reporter: Xiaobing Zhou
> Assignee: Xiaobing Zhou
>
> PROBLEM: Hive doesn't not have the following built-in functions.
> 1) MONTHS_BETWEEN(d1,d2)
> 2) LAST_DAY(d)
> 3) FIRST_DAY(d)
> 4) ADD_MONTHS (date, integer)
> 5) CHR()
> 6) REPLACE(char, search_string, replacement_string)
> 7) TRANSLATE(expr, from_string, to_string)
> Without these, not able to do certain analysis.
> USE CASE:
> 1) MONTHS_BETWEEN(d1,d2)
> 2) LAST_DAY(d)
> 3) FIRST_DAY(d)
> 4) ADD_MONTHS (date, integer)
> ADD_MONTHS returns the date date plus integer months. If date is the last day
> of the month or if the resulting month has fewer days than the day component
> of date, then the result is the last day of the resulting month. Otherwise,
> the result has the same day component as date.
> 5) CHR()
> CHR returns the character having the binary equivalent to n (where n is
> between 0 and 255)as a VARCHAR2 value
> 6) REPLACE(char, search_string, replacement_string)
> REPLACE returns char with every occurrence of search_string replaced with
> replacement_string.
> SELECT REPLACE('JACK and JUE','J','BL') "Changes";
> Changes
> --------------
> BLACK and BLUE
> 7) TRANSLATE(expr, from_string, to_string)
> TRANSLATE returns expr with all occurrences of each character in from_string
> replaced by its corresponding character in to_string.
> SELECT TRANSLATE('2KR 229', '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ ',
> '9999999999XXXXXXXXXXXXXXXXXXXXXXXXXX-') (CHAR(26)) "License";
> License
> -------
> 9XX-999
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