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https://issues.apache.org/jira/browse/SPARK-5746?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14320562#comment-14320562
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Yin Huai commented on SPARK-5746:
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For now, we will throw an error when we find this case.
> INSERT OVERWRITE throws FileNotFoundException when the source and destination
> point to the same table.
> ------------------------------------------------------------------------------------------------------
>
> Key: SPARK-5746
> URL: https://issues.apache.org/jira/browse/SPARK-5746
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.3.0
> Reporter: Cheng Lian
> Assignee: Cheng Lian
> Priority: Blocker
>
> With the newly introduced write support of data source API, {{JSONRelation}}
> and {{ParquetRelation2}} both suffer this bug.
> The root cause is that we removed the source table before insertion
> ([here|https://github.com/apache/spark/blob/1ac099e3e00ddb01af8e6e3a84c70f8363f04b5c/sql/core/src/main/scala/org/apache/spark/sql/json/JSONRelation.scala#L112-L121]).
> The correct solution should be first insert into a temporary folder, and then
> overwrite the source table.
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