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https://issues.apache.org/jira/browse/SPARK-17409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15742577#comment-15742577
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Josh Rosen commented on SPARK-17409:
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This was actually fixed in branch-2.x as well, via SPARK-17892.
> Query in CTAS is Optimized Twice
> --------------------------------
>
> Key: SPARK-17409
> URL: https://issues.apache.org/jira/browse/SPARK-17409
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: Xiao Li
> Assignee: Xiao Li
> Priority: Critical
> Labels: correctness
> Fix For: 2.1.0
>
>
> The query in CTAS is optimized twice, as reported in the PR:
> https://github.com/apache/spark/pull/14797
> {quote}
> Some analyzer rules have assumptions on logical plans, optimizer may break
> these assumption, we should not pass an optimized query plan into
> QueryExecution (will be analyzed again), otherwise we may some weird bugs.
> {quote}
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