Github user zjffdu commented on the pull request:
https://github.com/apache/spark/pull/9223#issuecomment-151143545
Still put the input paths checking in JsonRelation. Because there's still
some cases that is valid for empty input. e.g. when creating a table based on
an empty directory. The base class HadoopFsRelation don't know when
fileStatusCache will be used. So it would be better put the input paths
checking in sub class.
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