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https://issues.apache.org/jira/browse/SPARK-3298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14143637#comment-14143637
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Michael Armbrust commented on SPARK-3298:
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I think the plan here is to add an allowExisting flag to registerTempTable that
checks to see if the table exists and throws an exception. This flag will
default to false. I'll add this as part of the work I'm going to fix our
caching behavior.
> [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
> Assignee: Michael Armbrust
> 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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