Added another test to check trailing spaces

Author: rahulsmahadev

sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/util/DateTimeUtilsSuite.scala

@@ -456,12 +456,18 @@ class DateTimeUtilsSuite extends SparkFunSuite with Matchers {
     }
   }
 
-  test("trailing characters while converting string to timestamp") {
+  test("trailing colon while converting string to timestamp") {
     val s = UTF8String.fromString("2019-10-31T10:59:23Z:::")
     val time = DateTimeUtils.stringToTimestamp(s, defaultZoneId)
     assert(time == None)
   }
 
+  test("trailing space while converting string to timestamp") {
+    val s = UTF8String.fromString("2019-10-31T10:59:23ZZ   ")
+    val time = DateTimeUtils.stringToTimestamp(s, defaultZoneId)
+    assert(time == None)
+  }
+
   test("truncTimestamp") {
     def testTrunc(
         level: Int,