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https://issues.apache.org/jira/browse/SPARK-10617?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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shao lo reopened SPARK-10617:
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The bug is not that add_months is wrong. The bug is that order of evaluation
is wrong.
The two queries in the description can't have different answers.
> Leap year miscalculated in sql query
> ------------------------------------
>
> Key: SPARK-10617
> URL: https://issues.apache.org/jira/browse/SPARK-10617
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.5.0, 1.5.1, 1.6.0
> Reporter: shao lo
>
> -- This is wrong...returns 2016-03-01
> select date_add(add_months(cast('2015-02-28' as date), 1 * 12), 1)
> -- This is right...returns 2016-02-29
> select date_add(cast('2016-02-28' as date), 1)
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