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https://issues.apache.org/jira/browse/SPARK-3298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14297152#comment-14297152
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Apache Spark commented on SPARK-3298:
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User 'OopsOutOfMemory' has created a pull request for this issue:
https://github.com/apache/spark/pull/4271

> [SQL] registerAsTable / registerTempTable overwrites old tables
> ---------------------------------------------------------------
>
>                 Key: SPARK-3298
>                 URL: https://issues.apache.org/jira/browse/SPARK-3298
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 1.0.2
>            Reporter: Evan Chan
>            Priority: Minor
>              Labels: newbie
>
> At least in Spark 1.0.2,  calling registerAsTable("a") when "a" had been 
> registered before does not cause an error.  However, there is no way to 
> access the old table, even though it may be cached and taking up space.
> How about at least throwing an error?



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