Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/4446#discussion_r24306375
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/sources/modes.scala
---
@@ -0,0 +1,48 @@
+/*
+ * 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.sources
+
+/**
+ * SaveMode is used to specify the expected behavior of saving a
DataFrame to a data source.
+ */
+abstract class SaveMode {
+
+}
+
+/**
+ * Append mode means that when saving a DataFrame to a data source, if
data already exists,
+ * contents of the DataFrame are expected to be appended to existing data.
+ *
+ * Please use the singleton [[SaveModes.Append]].
+ */
--- End diff --
i thought we were going to use a Java enum? how do you use the enums in
Java? I thought we were going to use Java enum which is usable for both.
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