Github user dongjoon-hyun commented on a diff in the pull request:

    https://github.com/apache/spark/pull/16579#discussion_r97250343
  
    --- Diff: sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala 
---
    @@ -982,6 +982,33 @@ class SQLQuerySuite extends QueryTest with 
SharedSQLContext {
         spark.sessionState.conf.clear()
       }
     
    +  test("SPARK-19218 SET command should show a result in a sorted order") {
    +    val overrideConfs = sql("SET").collect()
    +    sql(s"SET test.key3=1")
    +    sql(s"SET test.key2=2")
    +    sql(s"SET test.key1=3")
    +    val result = sql("SET").collect()
    +    assert(result ===
    +      (overrideConfs ++ Seq(
    +        Row("test.key1", "3"),
    +        Row("test.key2", "2"),
    +        Row("test.key3", "1"))).sortBy(_.getString(0))
    +    )
    +    spark.sessionState.conf.clear()
    +  }
    +
    +  test("SPARK-19218 `SET -v` should not fail with null value 
configuration") {
    +    import SQLConf._
    +    val confEntry = 
SQLConfigBuilder("spark.test").doc("doc").stringConf.createWithDefault(null)
    +
    +    try {
    +      val result = sql("SET -v").collect()
    +      assert(result === result.sortBy(_.getString(0)))
    --- End diff --
    
    Maybe, we are confusing on *terms*.
    - You meant the other test *statements*.
    - I meant the other test *cases*


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