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https://issues.apache.org/jira/browse/SPARK-19225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15825714#comment-15825714
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Apache Spark commented on SPARK-19225:
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User 'discipleforteen' has created a pull request for this issue:
https://github.com/apache/spark/pull/16612
> Spark SQL round constant double return null
> --------------------------------------------
>
> Key: SPARK-19225
> URL: https://issues.apache.org/jira/browse/SPARK-19225
> Project: Spark
> Issue Type: Bug
> Affects Versions: 2.0.0, 2.0.1, 2.0.2, 2.1.0
> Reporter: discipleforteen
> Original Estimate: 1m
> Remaining Estimate: 1m
>
> Spark SQL round constant double value may return null . like 'select
> round(4.4, 2)' return null in spark 2.x. it's not compatible with spark 1.x
> version. it seems 4.4 is casted to decimal with new SqlBase.g4 , which is
> casted to double in spark 1.x version. round decimal 4.4, 2 get null in
> changeprecision...
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