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https://issues.apache.org/jira/browse/HIVE-9518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14389381#comment-14389381
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Mohit Sabharwal commented on HIVE-9518:
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lgtm, +1 (non-binding)
> Implement MONTHS_BETWEEN aligned with Oracle one
> ------------------------------------------------
>
> Key: HIVE-9518
> URL: https://issues.apache.org/jira/browse/HIVE-9518
> Project: Hive
> Issue Type: Improvement
> Components: UDF
> Reporter: Xiaobing Zhou
> Assignee: Alexander Pivovarov
> Attachments: HIVE-9518.1.patch, HIVE-9518.2.patch, HIVE-9518.3.patch,
> HIVE-9518.4.patch, HIVE-9518.5.patch, HIVE-9518.6.patch, HIVE-9518.7.patch,
> HIVE-9518.8.patch, HIVE-9518.9.patch
>
>
> This is used to track work to build Oracle like months_between. Here's
> semantics:
> MONTHS_BETWEEN returns number of months between dates date1 and date2. If
> date1 is later than date2, then the result is positive. If date1 is earlier
> than date2, then the result is negative. If date1 and date2 are either the
> same days of the month or both last days of months, then the result is always
> an integer. Otherwise Oracle Database calculates the fractional portion of
> the result based on a 31-day month and considers the difference in time
> components date1 and date2.
> Should accept date, timestamp and string arguments in the format 'yyyy-MM-dd'
> or 'yyyy-MM-dd HH:mm:ss'.
> The result should be rounded to 8 decimal places.
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