spark SupportsStreamingUpdateAsAppend 源码
spark SupportsStreamingUpdateAsAppend 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/internal/connector/SupportsStreamingUpdateAsAppend.scala
/*
* 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.internal.connector
import org.apache.spark.sql.connector.write.WriteBuilder
/**
* An internal `WriteBuilder` mixin to support UPDATE streaming output mode. Now there's no good
* way to pass the `keys` to upsert or replace (delete -> append), we do the same with append writes
* and let end users to deal with.
*
* This approach may be still valid for streaming writers which can't do the upsert or replace.
* We can promote the API to the official API along with the new API for upsert/replace.
*/
// TODO: design an official API for streaming output mode UPDATE which can do the upsert
// (or delete -> append).
trait SupportsStreamingUpdateAsAppend extends WriteBuilder {
}
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