Github user viirya commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18852#discussion_r131534140
  
    --- Diff: 
sql/core/src/test/scala/org/apache/spark/sql/internal/SQLConfSuite.scala ---
    @@ -270,4 +270,15 @@ class SQLConfSuite extends QueryTest with 
SharedSQLContext {
         val e2 = 
intercept[AnalysisException](spark.conf.unset(SCHEMA_STRING_LENGTH_THRESHOLD.key))
         assert(e2.message.contains("Cannot modify the value of a static 
config"))
       }
    +
    +  test("SPARK-21588 SQLContext.getConf(key, null) should return null") {
    +    withSQLConf(SQLConf.SHUFFLE_PARTITIONS.key -> "1") {
    +      assert("1" == spark.conf.get(SQLConf.SHUFFLE_PARTITIONS.key, null))
    +      assert("1" == spark.conf.get(SQLConf.SHUFFLE_PARTITIONS.key, 
"<undefined>"))
    +    }
    +
    +    assert(spark.conf.getOption("spark.sql.nonexistent").isEmpty)
    +    assert(null == spark.conf.get("spark.sql.nonexistent", null))
    --- End diff --
    
    Because the key doesn't exist, this doesn't actually test the issue. This 
line passes without this change too.


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