Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/19521
Oh, I confused with what I'm watching in these days.
For your example, Parquet also doesn't support. We may create an issue for
both Parquet/ORC on empty schema .
```scala
scala> val rddNoCols = sparkContext.parallelize(1 to 10).map(_ => Row.empty)
scala> val dfNoCols = spark.createDataFrame(rddNoCols,
StructType(Seq.empty))
scala> dfNoCols.write.format("parquet").saveAsTable("px")
17/10/18 05:46:17 ERROR Utils: Aborting task
org.apache.parquet.schema.InvalidSchemaException: Cannot write a schema
with an empty group: message spark_schema {
}
```
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