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https://issues.apache.org/jira/browse/HIVE-9357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14276570#comment-14276570
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Alexander Pivovarov commented on HIVE-9357:
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according to Quora ADD_MONTS is #1 feature gap in hive
http://www.quora.com/Apache-Hive/What-are-the-biggest-feature-gaps-between-HiveQL-and-SQL
When people say ADD_MONTHS they mean Oracle ADD_MONTHS implementation logic.
I searched "ADD_MONTHS finction" in google - first page (first 10 results)
mention oracle add_months
https://www.google.com/#q=add_months+function
> Create ADD_MONTHS UDF
> ---------------------
>
> Key: HIVE-9357
> URL: https://issues.apache.org/jira/browse/HIVE-9357
> Project: Hive
> Issue Type: Improvement
> Components: UDF
> Reporter: Alexander Pivovarov
> Assignee: Alexander Pivovarov
> Attachments: HIVE-9357.1.patch
>
>
> ADD_MONTHS adds a number of months to startdate:
> add_months('2015-01-14', 1) = '2015-02-14'
> add_months('2015-01-31', 1) = '2015-02-28'
> add_months('2015-02-28', 2) = '2015-04-30'
> add_months('2015-02-28', 12) = '2016-02-29'
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