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https://issues.apache.org/jira/browse/SPARK-25208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16590074#comment-16590074
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Apache Spark commented on SPARK-25208:
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User 'ueshin' has created a pull request for this issue:
https://github.com/apache/spark/pull/22200
> Loosen Cast.forceNullable for DecimalType.
> ------------------------------------------
>
> Key: SPARK-25208
> URL: https://issues.apache.org/jira/browse/SPARK-25208
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Takuya Ueshin
> Priority: Major
>
> Casting to {{DecimalType}} is not always needed to force nullable.
> If the decimal type to cast is wider than original type, or only truncating
> or precision loss, the casted value won't be {{null}}.
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