Github user adrian-wang commented on a diff in the pull request:
https://github.com/apache/spark/pull/3732#discussion_r22924040
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/date/Date.scala ---
@@ -0,0 +1,115 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.types.date
+
+import java.util.{Calendar, TimeZone}
+
+/**
+ * A mutable implementation of java.sql.Date that holds an Int for days
since epoch, like Hive.
+ */
+final class Date extends Ordered[Date] with Serializable {
+ private var daysSinceEpoch: Int = 0
+
+ /**
+ * Set this Decimal to the given Long. Will have precision 20 and scale
0.
+ */
+ def set(days: Int): Date = {
+ this.daysSinceEpoch = days
+ this
+ }
+
+ /**
+ * Set this Decimal to the given Int. Will have precision 10 and scale 0.
+ */
+ def set(days: Long): Date = {
+ this.daysSinceEpoch = days.toInt
+ this
+ }
+
+ /**
+ * Set this Decimal to the given BigDecimal value, inheriting its
precision and scale.
+ */
+ def set(date: Date): Date = {
+ this.daysSinceEpoch = date.daysSinceEpoch
+ this
+ }
+
+ def toDays: Int = {
+ this.daysSinceEpoch
+ }
+
+ def toJavaDate: java.sql.Date = {
+ new java.sql.Date(toLong)
+ }
+
+ override def toString: String = toJavaDate.toString()
+
+ def toLong: Long = {
--- End diff --
This follows the cast rules of Hive. However, we can do this in Cast.scala
only.
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