morrySnow commented on code in PR #9807: URL: https://github.com/apache/incubator-doris/pull/9807#discussion_r885167412
########## fe/fe-core/src/main/java/org/apache/doris/nereids/pattern/GroupExpressionMatching.java: ########## @@ -0,0 +1,130 @@ +// 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.doris.nereids.pattern; + +import org.apache.doris.nereids.memo.GroupExpression; +import org.apache.doris.nereids.trees.TreeNode; +import org.apache.doris.nereids.trees.Utils; + +import com.google.common.collect.Lists; + +import java.util.Iterator; +import java.util.List; +import java.util.NoSuchElementException; +import java.util.Objects; + +/** + * Get all pattern matching subtree in query plan from a group expression. + */ +public class GroupExpressionMatching<NODE_TYPE extends TreeNode> implements Iterable<NODE_TYPE> { + private final Pattern pattern; + private final GroupExpression groupExpression; + + public GroupExpressionMatching(Pattern pattern, GroupExpression groupExpression) { + this.pattern = Objects.requireNonNull(pattern); + this.groupExpression = Objects.requireNonNull(groupExpression); + } + + @Override + public GroupExpressionIterator<NODE_TYPE> iterator() { + return new GroupExpressionIterator<>(pattern, groupExpression); + } + + /** + * Iterator to get all subtrees. + */ + public static class GroupExpressionIterator<NODE_TYPE extends TreeNode> implements Iterator<NODE_TYPE> { + private final List<NODE_TYPE> results; Review Comment: yes, will change it in later PR -- 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. To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For additional commands, e-mail: commits-h...@doris.apache.org
