Github user gatorsmile commented on a diff in the pull request:
    --- Diff: sql/core/src/test/scala/org/apache/spark/sql/jdbc/JDBCSuite.scala 
    @@ -1007,4 +1007,23 @@ class JDBCSuite extends SparkFunSuite
           assert(sql("select * from people_view").count() == 3)
    +  test("SPARK-21519: option sessionInitStatement, run SQL to initialize 
the database session.") {
    +    val initSQL1 = "SET @MYTESTVAR 21519"
    +    val df1 ="jdbc")
    +      .option("url", urlWithUserAndPass)
    +      .option("dbtable", "(SELECT NVL(@MYTESTVAR, -1))")
    +      .option("sessionInitStatement", initSQL1)
    +      .load()
    +    assert(df1.collect() === Array(Row(21519)))
    +    val initSQL2 = "SET SCHEMA DUMMY"
    --- End diff --
    Sorry, I might not explain it clearly. Is that possible we can have a test 
case to send more than one statements in a single session initialization? Now 
these two examples have only one statement.

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