[SPARK-13114][SQL] Add a test for tokens more than the fields in schema

https://issues.apache.org/jira/browse/SPARK-13114

This PR adds a test for tokens more than the fields in schema.

Author: hyukjinkwon <gurwls223@gmail.com>

Closes #11020 from HyukjinKwon/SPARK-13114.

sql/core/src/test/resources/cars-malformed.csv

+~ All the rows here are malformed having tokens more than the schema (header).
+year,make,model,comment,blank
+"2012","Tesla","S","No comment",,null,null
+
+1997,Ford,E350,"Go get one now they are going fast",,null,null
+2015,Chevy,,,,

sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/csv/CSVSuite.scala

@@ -28,6 +28,7 @@ import org.apache.spark.sql.types._
 
 class CSVSuite extends QueryTest with SharedSQLContext with SQLTestUtils {
   private val carsFile = "cars.csv"
+  private val carsMalformedFile = "cars-malformed.csv"
   private val carsFile8859 = "cars_iso-8859-1.csv"
   private val carsTsvFile = "cars.tsv"
   private val carsAltFile = "cars-alternative.csv"
@@ -191,6 +192,17 @@ class CSVSuite extends QueryTest with SharedSQLContext with SQLTestUtils {
     assert(exception.getMessage.contains("Malformed line in FAILFAST mode: 2015,Chevy,Volt"))
   }
 
+  test("test for tokens more than the fields in the schema") {
+    val cars = sqlContext
+      .read
+      .format("csv")
+      .option("header", "false")
+      .option("comment", "~")
+      .load(testFile(carsMalformedFile))
+
+    verifyCars(cars, withHeader = false, checkTypes = false)
+  }
+
   test("test with null quote character") {
     val cars = sqlContext.read
       .format("csv")