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https://issues.apache.org/jira/browse/SPARK-22675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16276405#comment-16276405
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Apache Spark commented on SPARK-22675:
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User 'gatorsmile' has created a pull request for this issue:
https://github.com/apache/spark/pull/19874
> Refactoring PropagateTypes in TypeCoercion
> ------------------------------------------
>
> Key: SPARK-22675
> URL: https://issues.apache.org/jira/browse/SPARK-22675
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Xiao Li
> Assignee: Xiao Li
>
> PropagateTypes are called twice in TypeCoercion. We do not need to call it
> twice. Instead, we should call it after each change on the types.
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