HeartSaVioR commented on a change in pull request #31570: URL: https://github.com/apache/spark/pull/31570#discussion_r596654034
########## File path: sql/core/src/main/scala/org/apache/spark/sql/execution/SessionWindowMergeExec.scala ########## @@ -0,0 +1,180 @@ +/* + * 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.execution + +import scala.collection.mutable + +import org.apache.spark.rdd.RDD +import org.apache.spark.sql.catalyst.InternalRow +import org.apache.spark.sql.catalyst.expressions._ +import org.apache.spark.sql.catalyst.plans.physical.{ClusteredDistribution, Distribution, Partitioning} + +/** + * The physical plan for streaming query, merge session window after restore from state store. + * Note: the end time of window that restore from statestore has already contain session windowGap + * + * @param windowExpressions + * @param sessionSpec + * @param child + */ +case class SessionWindowMergeExec( + windowExpressions: NamedExpression, + sessionSpec: Seq[Expression], + child: SparkPlan) + extends UnaryExecNode { + + override def requiredChildDistribution: Seq[Distribution] = { + ClusteredDistribution(sessionSpec) :: Nil + } + + // Data should be sorted, so we can merge session window directly. + // TODO: use this requirement for simplicity, not necessary to sort the whole dataset, + // try better way later. Review comment: If I remember correctly, we still have to sort to handle new event earlier than session stored in state store. "event time processing" means events can be "out of order". ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
