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[opt](Nereids) let lead and lag type coersion behavior same with MySQL
For input and default are numeric types, use below priority - DecimalV3 - DecimalV2 - Double - Float - LargeInt - BigInt - Int - SmallInt - TinyInt For input and default are Date or DateTime types, user below priority - DateTimeV2 - DateTime - DateV2 - Date other wise, use String
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143
.../src/main/java/org/apache/doris/nereids/trees/expressions/functions/window/LeadOrLag.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.trees.expressions.functions.window; | ||
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| import org.apache.doris.catalog.FunctionSignature; | ||
| import org.apache.doris.nereids.exceptions.AnalysisException; | ||
| import org.apache.doris.nereids.trees.expressions.Expression; | ||
| import org.apache.doris.nereids.trees.expressions.functions.CustomSignature; | ||
| import org.apache.doris.nereids.trees.expressions.literal.Literal; | ||
| import org.apache.doris.nereids.trees.expressions.shape.TernaryExpression; | ||
| import org.apache.doris.nereids.types.BigIntType; | ||
| import org.apache.doris.nereids.types.DataType; | ||
| import org.apache.doris.nereids.types.DateTimeType; | ||
| import org.apache.doris.nereids.types.DateTimeV2Type; | ||
| import org.apache.doris.nereids.types.DateType; | ||
| import org.apache.doris.nereids.types.DateV2Type; | ||
| import org.apache.doris.nereids.types.DecimalV2Type; | ||
| import org.apache.doris.nereids.types.DecimalV3Type; | ||
| import org.apache.doris.nereids.types.DoubleType; | ||
| import org.apache.doris.nereids.types.StringType; | ||
| import org.apache.doris.nereids.util.TypeCoercionUtils; | ||
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| import java.util.List; | ||
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| /** | ||
| * types used for specific window functions. | ||
| * This list is equal with Type.trivialTypes used in legacy planner | ||
| */ | ||
| public abstract class LeadOrLag extends WindowFunction implements TernaryExpression, CustomSignature { | ||
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| public LeadOrLag(String name, Expression child, Expression offset, Expression defaultValue) { | ||
| super(name, child, offset, defaultValue); | ||
| } | ||
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| protected LeadOrLag(String name, List<Expression> children) { | ||
| super(name, children); | ||
| } | ||
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| public Expression getOffset() { | ||
| if (children().size() <= 1) { | ||
| throw new AnalysisException("Not set offset of " + getName() + "(): " + this.toSql()); | ||
| } | ||
| return child(1); | ||
| } | ||
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| public Expression getDefaultValue() { | ||
| if (children.size() <= 2) { | ||
| throw new AnalysisException("Not set default value of " + getName() + "(): " + this.toSql()); | ||
| } | ||
| return child(2); | ||
| } | ||
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| @Override | ||
| public boolean nullable() { | ||
| if (children.size() == 3 && child(2).nullable()) { | ||
| return true; | ||
| } | ||
| return child(0).nullable(); | ||
| } | ||
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| @Override | ||
| public DataType getDataType() { | ||
| return child(0).getDataType(); | ||
| } | ||
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| @Override | ||
| public void checkLegalityBeforeTypeCoercion() { | ||
| if (children().size() == 1) { | ||
| return; | ||
| } | ||
| if (children().size() >= 2) { | ||
| checkValidParams(getOffset(), true); | ||
| if (getOffset() instanceof Literal) { | ||
| if (((Literal) getOffset()).getDouble() < 0) { | ||
| throw new AnalysisException( | ||
| "The offset parameter of " + getName() | ||
| + " must be a constant positive integer: " + this.toSql()); | ||
| } | ||
| } else { | ||
| throw new AnalysisException( | ||
| "The offset parameter of " + getName() | ||
| + " must be a constant positive integer: " + this.toSql()); | ||
| } | ||
| if (children().size() >= 3) { | ||
| checkValidParams(getDefaultValue(), false); | ||
| } | ||
| } | ||
| } | ||
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| @Override | ||
| public FunctionSignature customSignature() { | ||
| DataType inputType = getArgument(0).getDataType(); | ||
| DataType defaultType = getDefaultValue().getDataType(); | ||
| DataType commonType = inputType; | ||
| if (inputType.isNumericType() && defaultType.isNumericType()) { | ||
| for (DataType dataType : TypeCoercionUtils.NUMERIC_PRECEDENCE) { | ||
| if (inputType.equals(dataType) || defaultType.equals(dataType)) { | ||
| commonType = dataType; | ||
| break; | ||
| } | ||
| } | ||
| if (commonType.isFloatLikeType() && (inputType.isDecimalV3Type() || defaultType.isDecimalV3Type())) { | ||
| commonType = DoubleType.INSTANCE; | ||
| } | ||
| if (inputType.isDecimalV2Type() || defaultType.isDecimalV2Type()) { | ||
| commonType = DecimalV2Type.SYSTEM_DEFAULT; | ||
| } | ||
| if (inputType.isDecimalV3Type() || defaultType.isDecimalV3Type()) { | ||
| commonType = DecimalV3Type.widerDecimalV3Type( | ||
| DecimalV3Type.forType(inputType), DecimalV3Type.forType(defaultType), true); | ||
| } | ||
| } else if (inputType.isDateLikeType() && inputType.isDateLikeType()) { | ||
| if (inputType.isDateTimeV2Type() || defaultType.isDateTimeV2Type()) { | ||
| commonType = DateTimeV2Type.getWiderDatetimeV2Type( | ||
| DateTimeV2Type.forType(inputType), DateTimeV2Type.forType(defaultType)); | ||
| } else if (inputType.isDateTimeType() || defaultType.isDateTimeType()) { | ||
| commonType = DateTimeType.INSTANCE; | ||
| } else if (inputType.isDateV2Type() || defaultType.isDateV2Type()) { | ||
| commonType = DateV2Type.INSTANCE; | ||
| } else { | ||
| commonType = DateType.INSTANCE; | ||
| } | ||
| } else if (!defaultType.isNullType()) { | ||
| commonType = StringType.INSTANCE; | ||
| } | ||
| return FunctionSignature.ret(commonType).args(commonType, BigIntType.INSTANCE, commonType); | ||
| } | ||
| } |
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