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https://issues.apache.org/jira/browse/HIVE-15511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15779787#comment-15779787
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Lefty Leverenz commented on HIVE-15511:
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Doc note: The roundOff option for months_between() needs to be documented in
the wiki (with version information).
* [Hive Operators and UDFs -- Date Functions |
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF#LanguageManualUDF-DateFunctions]
Added a TODOC2.2 label.
> Provide an option in months_between UDF to disable rounding-off
> ---------------------------------------------------------------
>
> Key: HIVE-15511
> URL: https://issues.apache.org/jira/browse/HIVE-15511
> Project: Hive
> Issue Type: Improvement
> Reporter: Rajesh Balamohan
> Assignee: Rajesh Balamohan
> Priority: Minor
> Labels: TODOC2.2
> Fix For: 2.2.0
>
> Attachments: HIVE-15511.1.patch, HIVE-15511.2.patch,
> HIVE-15511.3.patch, HIVE-15511.4.patch
>
>
> Rounding off was added in {{GenericUDFMonthsBetween}} so that it can be
> compatible with systems like oracle. However, there are places where rounding
> off is not needed.
> E.g "CAST(MONTHS_BETWEEN(l_shipdate, l_commitdate) / 12 AS INT)" may not need
> rounding off via BigDecimal which is compute intensive.
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