Github user yanbohappy commented on the pull request: https://github.com/apache/spark/pull/4607#issuecomment-74405767 Actually, the insert function (https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/json/JSONRelation.scala#L107) will be not called any time. The "CTAS" command is just executed at https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/json/JSONRelation.scala#L81
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