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https://issues.apache.org/jira/browse/SPARK-20302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15965354#comment-15965354
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Apache Spark commented on SPARK-20302:
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User 'rxin' has created a pull request for this issue:
https://github.com/apache/spark/pull/17614
> Short circuit cast when from and to types are structurally the same
> -------------------------------------------------------------------
>
> Key: SPARK-20302
> URL: https://issues.apache.org/jira/browse/SPARK-20302
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: Reynold Xin
> Assignee: Reynold Xin
>
> When we perform a cast expression and the from and to types are structurally
> the same (having the same structure but different field names), we should be
> able to skip the actual cast.
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