Github user zjffdu commented on the pull request:
https://github.com/apache/spark/pull/9223#issuecomment-153972020
@chenghao-intel The JsonRelation has another special case that it allow
input paths as empty when it takes RDD[String] as input. So HadoopFsRelation
can not assume all its sub classes must have non-empty input paths. Maybe need
to add another flag "allowEmptyInputPaths" in HadoopFsRelation and allow its
implementation to decide that.
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