Github user tdas commented on a diff in the pull request: https://github.com/apache/spark/pull/13342#discussion_r66552040 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/ForeachWriter.scala --- @@ -0,0 +1,105 @@ +/* + * 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 +import org.apache.spark.sql.streaming.ContinuousQuery + +/** + * :: Experimental :: + * A class to consume data generated by a [[ContinuousQuery]]. Typically this is used to send the + * generated data to external systems. Each partition will use a new deserialized instance, so you + * usually should do all the initialization (e.g. opening a connection or initiating a transaction) + * in the open method --- End diff -- nit: missing period.
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