[SPARK-2729] [SQL] Forgot to match Timestamp type in ColumnBuilder

just a match forgot, found after SPARK-2710 , TimestampType can be used by a SchemaRDD generated from JDBC ResultSet

Author: chutium <[email protected]>

Closes #1636 from chutium/SPARK-2729 and squashes the following commits:

71af77a [chutium] [SPARK-2729] [SQL] added Timestamp in NullableColumnAccessorSuite
39cf9f8 [chutium] [SPARK-2729] add Timestamp Type into ColumnBuilder TestSuite, ref. #1636
ab6ff97 [chutium] [SPARK-2729] Forgot to match Timestamp type in ColumnBuilder

Author: chutium

sql/core/src/main/scala/org/apache/spark/sql/columnar/ColumnBuilder.scala

@@ -154,6 +154,7 @@ private[sql] object ColumnBuilder {
       case STRING.typeId  => new StringColumnBuilder
       case BINARY.typeId  => new BinaryColumnBuilder
       case GENERIC.typeId => new GenericColumnBuilder
+      case TIMESTAMP.typeId => new TimestampColumnBuilder
     }).asInstanceOf[ColumnBuilder]
 
     builder.initialize(initialSize, columnName, useCompression)

sql/core/src/test/scala/org/apache/spark/sql/columnar/NullableColumnAccessorSuite.scala

@@ -41,7 +41,7 @@ object TestNullableColumnAccessor {
 class NullableColumnAccessorSuite extends FunSuite {
   import ColumnarTestUtils._
 
-  Seq(INT, LONG, SHORT, BOOLEAN, BYTE, STRING, DOUBLE, FLOAT, BINARY, GENERIC).foreach {
+  Seq(INT, LONG, SHORT, BOOLEAN, BYTE, STRING, DOUBLE, FLOAT, BINARY, GENERIC, TIMESTAMP).foreach {
     testNullableColumnAccessor(_)
   }
 

sql/core/src/test/scala/org/apache/spark/sql/columnar/NullableColumnBuilderSuite.scala

@@ -37,7 +37,7 @@ object TestNullableColumnBuilder {
 class NullableColumnBuilderSuite extends FunSuite {
   import ColumnarTestUtils._
 
-  Seq(INT, LONG, SHORT, BOOLEAN, BYTE, STRING, DOUBLE, FLOAT, BINARY, GENERIC).foreach {
+  Seq(INT, LONG, SHORT, BOOLEAN, BYTE, STRING, DOUBLE, FLOAT, BINARY, GENERIC, TIMESTAMP).foreach {
     testNullableColumnBuilder(_)
   }