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https://issues.apache.org/jira/browse/SPARK-4152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14189797#comment-14189797
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Apache Spark commented on SPARK-4152:
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User 'chenghao-intel' has created a pull request for this issue:
https://github.com/apache/spark/pull/3013
> Avoid data change in CTAS while table already existed
> -----------------------------------------------------
>
> Key: SPARK-4152
> URL: https://issues.apache.org/jira/browse/SPARK-4152
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Cheng Hao
> Assignee: Cheng Hao
> Priority: Minor
>
> CREATE TABLE t1 (a String);
> CREATE TABLE t1 AS SELECT key FROM src; -- throw exception
> CREATE TABLE if not exists t1 AS SELECT key FROM src; -- expect do nothing,
> actually will overwrite the t1.
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