Github user xwu0226 commented on a diff in the pull request:
    --- Diff: sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala 
    @@ -325,6 +325,24 @@ class DataFrameSuite extends QueryTest with 
SharedSQLContext {
    +  test("sorting with null ordering") {
    +    val data = Seq[java.lang.Integer](2, 1, null).toDF("key")
    --- End diff --
    Thanks for the cleanup and refining the test case! For the test case with 2 
column data, I was thinking to create a bit more complex ordering to utilize 
the prefix sort and regular `GenerateOrdering` in one query. But it is not 
necessary since the major PR for SQL interface has include such scenario. 

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