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https://issues.apache.org/jira/browse/SPARK-29364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16952828#comment-16952828
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Yuming Wang commented on SPARK-29364:
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Issue resolved by pull request 26112
[https://github.com/apache/spark/pull/26112|https://github.com/apache/spark/pull/26112]
> Return intervals from date subtracts
> ------------------------------------
>
> Key: SPARK-29364
> URL: https://issues.apache.org/jira/browse/SPARK-29364
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.4.4
> Reporter: Maxim Gekk
> Assignee: Maxim Gekk
> Priority: Minor
> Fix For: 3.0.0
>
>
> According to the SQL standard, date1 - date2 is an interval. See
> http://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt at +_4.5.3
> Operations involving datetimes and intervals_+. The ticket aims to modify the
> DateDiff expression to produce another expression of the INTERVAL type When
> wspark.sql.ansi.enabled` is set to *true* and `spark.sql.dialect` is *Spark*.
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