[SPARK-12195][SQL] Adding BigDecimal, Date and Timestamp into Encoder

This PR is to add three more data types into Encoder, including `BigDecimal`, `Date` and `Timestamp`.

marmbrus cloud-fan rxin Could you take a quick look at these three types? Not sure if it can be merged to 1.6. Thank you very much!

Author: gatorsmile <gatorsmile@gmail.com>

Closes #10188 from gatorsmile/dataTypesinEncoder.

1 files changed, 18 insertions, 0 deletions

diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/Encoder.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/Encoder.scala
index c40061ae0a..3ca5ade7f3 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/Encoder.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/Encoder.scala
@@ -98,6 +98,24 @@ object Encoders {
   def STRING: Encoder[java.lang.String] = ExpressionEncoder()
 
   /**
+    * An encoder for nullable decimal type.
+    * @since 1.6.0
+    */
+  def DECIMAL: Encoder[java.math.BigDecimal] = ExpressionEncoder()
+
+  /**
+    * An encoder for nullable date type.
+    * @since 1.6.0
+    */
+  def DATE: Encoder[java.sql.Date] = ExpressionEncoder()
+
+  /**
+    * An encoder for nullable timestamp type.
+    * @since 1.6.0
+    */
+  def TIMESTAMP: Encoder[java.sql.Timestamp] = ExpressionEncoder()
+
+  /**
    * Creates an encoder for Java Bean of type T.
    *
    * T must be publicly accessible.