Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/13286#discussion_r64976140
--- Diff: sql/catalyst/src/main/java/org/apache/spark/sql/OutputMode.java
---
@@ -0,0 +1,54 @@
+/*
+ * 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;
+
+import org.apache.spark.annotation.Experimental;
+
+/**
+ * :: Experimental ::
+ *
+ * OutputMode is used to what data will be written to a streaming sink
when there is
+ * new data available in a streaming DataFrame/Dataset.
+ *
+ * @since 2.0.0
+ */
+@Experimental
+public class OutputMode {
--- End diff --
We also need a trait OutputMode that InternalOutputModes.Append will
extend. Should that be a Scala trait or Java interface?
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