Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/19521
We can save an empty DataFrame as an ORC table, but we are unable to fetch
it from the table.
```Scala
val rddNoCols = sparkContext.parallelize(1 to 10).map(_ => Row.empty)
val dfNoCols = spark.createDataFrame(rddNoCols, StructType(Seq.empty))
dfNoCols.write.format("orc").saveAsTable("t")
spark.sql("select 1 from t").show()
```
This is not related to this upgrade, but you might be interested in this.
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