[SPARK-7234][SQL] Fix DateType mismatch when codegen on.

Author: 云峤 <chensong.cs@alibaba-inc.com>

Closes #5778 from kaka1992/fix_codegenon_datetype_mismatch and squashes the following commits:

1ad4cff [云峤] SPARK-7234 fix dateType mismatch

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala

@@ -672,6 +672,7 @@ abstract class CodeGenerator[InType <: AnyRef, OutType <: AnyRef] extends Loggin
     case DoubleType => ru.Literal(Constant(-1.toDouble))
     case DecimalType() => q"org.apache.spark.sql.types.Decimal(-1)"
     case IntegerType => ru.Literal(Constant(-1))
+    case DateType => ru.Literal(Constant(-1))
     case _ => ru.Literal(Constant(null))
   }