cloud-fan commented on a change in pull request #27400: [SPARK-30671][SQL]
emptyDataFrame should use a LocalRelation
URL: https://github.com/apache/spark/pull/27400#discussion_r373327838
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File path: sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala
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@@ -274,9 +274,7 @@ class SparkSession private(
* @since 2.0.0
*/
@transient
- lazy val emptyDataFrame: DataFrame = {
- createDataFrame(sparkContext.emptyRDD[Row].setName("empty"),
StructType(Nil))
- }
+ lazy val emptyDataFrame: DataFrame = Dataset.ofRows(self, LocalRelation())
Review comment:
`Dataset.ofRows(self, LocalRelation())` looks simpler as I don't need to
jump into another method when reading the code.
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