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fe/fe-core/src/main/java/org/apache/doris/nereids/cost/ExpressionCostEvaluator.java
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| // 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. | ||
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| package org.apache.doris.nereids.cost; | ||
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| import org.apache.doris.nereids.trees.expressions.Alias; | ||
| import org.apache.doris.nereids.trees.expressions.Expression; | ||
| import org.apache.doris.nereids.trees.expressions.SlotReference; | ||
| import org.apache.doris.nereids.trees.expressions.literal.Literal; | ||
| import org.apache.doris.nereids.trees.expressions.visitor.ExpressionVisitor; | ||
| import org.apache.doris.nereids.types.ArrayType; | ||
| import org.apache.doris.nereids.types.CharType; | ||
| import org.apache.doris.nereids.types.DecimalV2Type; | ||
| import org.apache.doris.nereids.types.DecimalV3Type; | ||
| import org.apache.doris.nereids.types.MapType; | ||
| import org.apache.doris.nereids.types.StringType; | ||
| import org.apache.doris.nereids.types.StructType; | ||
| import org.apache.doris.nereids.types.VarcharType; | ||
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| import com.google.common.collect.Maps; | ||
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| import java.util.Map; | ||
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| /** | ||
| * expression cost is calculated by | ||
| * 1. non-leaf tree node count: N | ||
| * 2. expression which contains input of stringType or complexType(array/json/struct...), add cost | ||
| */ | ||
| public class ExpressionCostEvaluator extends ExpressionVisitor<Double, Void> { | ||
| private static Map<Class, Double> dataTypeCost = Maps.newHashMap(); | ||
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| static { | ||
| dataTypeCost.put(DecimalV2Type.class, 1.5); | ||
| dataTypeCost.put(DecimalV3Type.class, 1.5); | ||
| dataTypeCost.put(StringType.class, 2.0); | ||
| dataTypeCost.put(CharType.class, 2.0); | ||
| dataTypeCost.put(VarcharType.class, 2.0); | ||
| dataTypeCost.put(ArrayType.class, 3.0); | ||
| dataTypeCost.put(MapType.class, 3.0); | ||
| dataTypeCost.put(StructType.class, 3.0); | ||
| } | ||
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| @Override | ||
| public Double visit(Expression expr, Void context) { | ||
| double cost = 0.0; | ||
| for (Expression child : expr.children()) { | ||
| cost += child.accept(this, context); | ||
| // the more children, the more computing cost | ||
| cost += dataTypeCost.getOrDefault(child.getDataType().getClass(), 0.1); | ||
| } | ||
| return cost; | ||
| } | ||
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| @Override | ||
| public Double visitSlotReference(SlotReference slot, Void context) { | ||
| return 0.0; | ||
| } | ||
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| @Override | ||
| public Double visitLiteral(Literal literal, Void context) { | ||
| return 0.0; | ||
| } | ||
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| @Override | ||
| public Double visitAlias(Alias alias, Void context) { | ||
| Expression child = alias.child(); | ||
| if (child instanceof SlotReference) { | ||
| return 0.0; | ||
| } | ||
| return alias.child().accept(this, context); | ||
| } | ||
| } |
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