Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/4896#issuecomment-77388603
A user may use jsonFile get a DF and then register it as a temp table.
He/she may then try to insert new data into this temp table. Since jsonFile is
not backed by the JSON data source right now, he/she will see an exception
saying that Spark SQL cannot find a physical plan for the given logical plan.
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