Which one of the following statements is TRUE?
A. Spark SQL does not support HiveQL
B. Spark SQL does not support ANSI SQL
C. To use Spark with Hive, HiveQL queries have to rewritten in Scala
D. Spark SQL allows relational queries expressed in SQL, HiveQL, or Scala
Reference: https://spark.apache.org/docs/1.2.1/sql-programming-guide.html (overview)