Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/20525#discussion_r166843930
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/FileBasedDataSourceSuite.scala ---
@@ -72,6 +73,26 @@ class FileBasedDataSourceSuite extends QueryTest with
SharedSQLContext {
}
}
+ Seq("orc", "parquet").foreach { format =>
+ test(s"SPARK-23271 empty RDD when saved should write a metadata only
file - $format") {
+ withTempDir { inputPath =>
+ withTempPath { outputPath =>
+ val anySchema = StructType(StructField("anyName", StringType) ::
Nil)
+ val df = spark.read.schema(anySchema).csv(inputPath.toString)
--- End diff --
an easier to create an empty dataframe:
`spark.emptyDataFrame.select(lit(1).as("i"))`
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