[SPARK-22258][SQL] Writing empty dataset fails with ORC format #19477
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What changes were proposed in this pull request?
Since SPARK-8501, Spark doesn't create an ORC file for empty data sets. However, SPARK-21669 is trying to get the length of the written file at the end of writing tasks and fails with
FileNotFoundException. This is a regression at 2.3.0 only. We had better fix this and have a test case to prevent future regression.How was this patch tested?
Pass the newly added test cases.