[SPARK-2050 - 2][SQL] DIV and BETWEEN should not be case sensitive.

Followup: #989

Author: Michael Armbrust <michael@databricks.com>

Closes #994 from marmbrus/caseSensitiveFunctions2 and squashes the following commits:

9d9c8ed [Michael Armbrust] Fix DIV and BETWEEN.

sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveQl.scala

@@ -795,6 +795,8 @@ private[hive] object HiveQl {
   val RLIKE = "(?i)RLIKE".r
   val REGEXP = "(?i)REGEXP".r
   val IN = "(?i)IN".r
+  val DIV = "(?i)DIV".r
+  val BETWEEN = "(?i)BETWEEN".r
 
   protected def nodeToExpr(node: Node): Expression = node match {
     /* Attribute References */
@@ -864,7 +866,7 @@ private[hive] object HiveQl {
     case Token("-", left :: right:: Nil) => Subtract(nodeToExpr(left), nodeToExpr(right))
     case Token("*", left :: right:: Nil) => Multiply(nodeToExpr(left), nodeToExpr(right))
     case Token("/", left :: right:: Nil) => Divide(nodeToExpr(left), nodeToExpr(right))
-    case Token("DIV", left :: right:: Nil) => Divide(nodeToExpr(left), nodeToExpr(right))
+    case Token(DIV(), left :: right:: Nil) => Divide(nodeToExpr(left), nodeToExpr(right))
     case Token("%", left :: right:: Nil) => Remainder(nodeToExpr(left), nodeToExpr(right))
 
     /* Comparisons */
@@ -885,7 +887,7 @@ private[hive] object HiveQl {
     case Token("TOK_FUNCTION", Token(IN(), Nil) :: value :: list) =>
       In(nodeToExpr(value), list.map(nodeToExpr))
     case Token("TOK_FUNCTION",
-           Token("between", Nil) ::
+           Token(BETWEEN(), Nil) ::
            Token("KW_FALSE", Nil) ::
            target ::
            minValue ::

sql/hive/src/test/resources/golden/between-0-570e4c4bf2968368ac2f325c6c940a06

+2	val_2

sql/hive/src/test/resources/golden/div-0-5e7fc5719c7265bc1d6af52005ebad03

+0	0	0

sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/HiveQuerySuite.scala

@@ -25,8 +25,10 @@ import org.apache.spark.sql.hive.test.TestHive._
 class HiveQuerySuite extends HiveComparisonTest {
 
   createQueryTest("between",
-    "SELECT * FROM src WHERE key between 1 and 2"
-  )
+    "SELECT * FROM src WHERE key Between 1 and 2")
+
+  createQueryTest("div",
+    "SELECT 1 DIV 2, 1 div 2, 1 dIv 2 FROM src LIMIT 1")
 
   test("Query expressed in SQL") {
     assert(sql("SELECT 1").collect() === Array(Seq(1)))