[GitHub] [incubator-doris] EmmyMiao87 commented on a diff in pull request #9446: [Enhancement](Optimizer) Optimize nereids tree node structure

[GitBox <gi...@apache.org>]

EmmyMiao87 commented on code in PR #9446:
URL: https://github.com/apache/incubator-doris/pull/9446#discussion_r867338822


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fe/fe-core/src/main/java/org/apache/doris/nereids/trees/AbstractTreeNode.java:
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@@ -0,0 +1,86 @@
+// 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.trees;
+
+import com.google.common.collect.ImmutableList;
+import org.apache.doris.catalog.Table;
+import org.apache.doris.nereids.trees.expressions.BinaryPredicate;
+import org.apache.doris.nereids.trees.expressions.SlotReference;
+import org.apache.doris.nereids.trees.plans.JoinType;
+import org.apache.doris.nereids.trees.plans.logical.LogicalJoin;
+import org.apache.doris.nereids.trees.plans.logical.LogicalRelation;
+import org.apache.doris.nereids.types.IntegerType;
+
+import java.util.List;
+
+/**
+ * Abstract class for plan node in Nereids, include plan node and expression.
+ *
+ * @param <NODE_TYPE> either {@link org.apache.doris.nereids.trees.plans.Plan}
+ *                 or {@link org.apache.doris.nereids.trees.expressions.Expression}
+ */
+public abstract class AbstractTreeNode<NODE_TYPE extends AbstractTreeNode<NODE_TYPE>>
+        implements TreeNode<NODE_TYPE> {
+
+    protected final NodeType type;
+    protected final List<TreeNode> children;
+
+    public AbstractTreeNode(NodeType type, TreeNode... children) {
+        this.type = type;
+        this.children = ImmutableList.copyOf(children);
+    }
+
+    public AbstractTreeNode(NodeType type, List<NODE_TYPE> children) {
+        this.type = type;
+        this.children = ImmutableList.copyOf(children);
+    }
+
+    @Override
+    public <CHILD_TYPE extends TreeNode<CHILD_TYPE>> List<CHILD_TYPE> children() {
+        return (List) children;
+    }
+
+    @Override
+    public <CHILD_TYPE extends TreeNode<CHILD_TYPE>> CHILD_TYPE child(int index) {
+        return (CHILD_TYPE) children.get(index);
+    }
+
+    public int arity() {
+        return children.size();
+    }
+
+    public static void main(String[] args) {

Review Comment:
   Remove this main function



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