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https://issues.apache.org/jira/browse/SPARK-8653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14602502#comment-14602502
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Apache Spark commented on SPARK-8653:
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User 'chenghao-intel' has created a pull request for this issue:
https://github.com/apache/spark/pull/7034
> Add constraint for Children expression for data type
> ----------------------------------------------------
>
> Key: SPARK-8653
> URL: https://issues.apache.org/jira/browse/SPARK-8653
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Cheng Hao
>
> Currently, we have trait in Expression like `ExpectsInputTypes` and also the
> `checkInputDataTypes`, but can not convert the children expressions
> automatically, except we write the new rules in the `HiveTypeCoercion`.
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