maropu commented on a change in pull request #30093: URL: https://github.com/apache/spark/pull/30093#discussion_r513086916
########## File path: sql/core/src/main/scala/org/apache/spark/sql/execution/RemoveRedundantSorts.scala ########## @@ -0,0 +1,46 @@ +/* + * 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 org.apache.spark.sql.catalyst.expressions.SortOrder +import org.apache.spark.sql.catalyst.rules.Rule +import org.apache.spark.sql.internal.SQLConf + +/** + * Remove redundant SortExec node from the spark plan. A sort node is redundant when + * its child satisfies both its sort orders and its required child distribution. Note + * this rule differs from the Optimizer rule EliminateSorts in that this rule also checks + * if the child satisfies the required distribution so that it is safe to remove not only a + * local sort but also a global sort when its child already satisfies required sort orders. + */ +case class RemoveRedundantSorts(conf: SQLConf) extends Rule[SparkPlan] { Review comment: > We should only backport the fix of EliminateSorts to 2.4. But, the partial backport can cause performance regressin in 2.4 ? (global sort -> global sort case) https://github.com/apache/spark/pull/30093#discussion_r508901147 ---------------------------------------------------------------- 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: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org
