morrySnow commented on code in PR #9807: URL: https://github.com/apache/incubator-doris/pull/9807#discussion_r885240252
########## fe/fe-core/src/main/java/org/apache/doris/nereids/pattern/GroupMatching.java: ########## @@ -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.doris.nereids.pattern; + +import org.apache.doris.nereids.memo.Group; +import org.apache.doris.nereids.memo.GroupExpression; +import org.apache.doris.nereids.operators.OperatorType; +import org.apache.doris.nereids.trees.TreeNode; + +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. + */ +public class GroupMatching<NODE_TYPE extends TreeNode> implements Iterable<NODE_TYPE> { + private final Pattern pattern; + private final Group group; + + public GroupMatching(Pattern pattern, Group group) { + this.pattern = Objects.requireNonNull(pattern); + this.group = Objects.requireNonNull(group); + } + + public Iterator<NODE_TYPE> iterator() { + return new GroupIterator<>(pattern, group); + } + + /** + * Iterator to get all subtrees from a group. + */ + public static class GroupIterator<NODE_TYPE extends TreeNode> implements Iterator<NODE_TYPE> { Review Comment: UTs and Java docs will added when Nereids is stable -- 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
