Github user rdblue commented on a diff in the pull request:
https://github.com/apache/spark/pull/22190#discussion_r212120878
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/sources/v2/writer/BatchPartitionOverwriteSupport.java
---
@@ -0,0 +1,44 @@
+/*
+ * 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.v2.writer;
+
+import org.apache.spark.sql.sources.v2.DataSourceOptions;
+import org.apache.spark.sql.types.StructType;
+
+/**
+ * An interface that adds support to {@link BatchWriteSupport} for a
replace data operation that
+ * replaces partitions dynamically with the output of a write operation.
+ * <p>
+ * Data source implementations can implement this interface in addition to
{@link BatchWriteSupport}
+ * to support write operations that replace all partitions in the output
table that are present
+ * in the write's output data.
+ * <p>
+ * This is used to implement INSERT OVERWRITE ... PARTITIONS.
+ */
+public interface BatchPartitionOverwriteSupport extends BatchWriteSupport {
--- End diff --
This class will be used to create a `WriteConfig` that instructs the data
source to replace partitions in the existing data with partitions of a
dataframe. The logical plan would be `DynamicPartitionOverwrite`.
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