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https://issues.apache.org/jira/browse/SPARK-25686?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marco Gaido resolved SPARK-25686.
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Resolution: Duplicate
> date_trunc Spark SQL function silently returns null if parameters are swapped
> -----------------------------------------------------------------------------
>
> Key: SPARK-25686
> URL: https://issues.apache.org/jira/browse/SPARK-25686
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.3.0, 2.3.1
> Reporter: Zack Behringer
> Priority: Minor
>
> date_trunc(a_timestamp, 'minute') returns null
> date_trunc('minute', a_timestamp) returns a valid timestamp
> it would be nice to have a runtime error to help catch the problem
> This was not helped by the fact that the doc examples had it swapped, but yesÂ
> I should have tested our use of it more thoroughly
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