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https://issues.apache.org/jira/browse/SPARK-21726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16158224#comment-16158224
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Apache Spark commented on SPARK-21726:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/19161
> Check for structural integrity of the plan in QO in test mode
> -------------------------------------------------------------
>
> Key: SPARK-21726
> URL: https://issues.apache.org/jira/browse/SPARK-21726
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Reynold Xin
> Assignee: Liang-Chi Hsieh
> Fix For: 2.3.0
>
>
> Right now we don't have any checks in the optimizer to check for the
> structural integrity of the plan (e.g. resolved). It would be great if in
> test mode, we can check whether a plan is still resolved after the execution
> of each rule, so we can catch rules that return invalid plans.
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