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Add utility functions to resolve intermediate type in generic aggrega…
…te functions
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presto-common/src/main/java/com/facebook/presto/common/type/TypeSignatureUtils.java
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| /* | ||
| * Licensed 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 com.facebook.presto.common.type; | ||
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|
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| import java.util.ArrayList; | ||
| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.Optional; | ||
| import java.util.stream.Collectors; | ||
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| import static java.util.Collections.unmodifiableList; | ||
|
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| public final class TypeSignatureUtils | ||
| { | ||
| private TypeSignatureUtils() {} | ||
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| public static TypeSignature resolveIntermediateType(TypeSignature actualTypeSignature, List<TypeSignature> actualTypeSignatureParameters, List<TypeSignature> expectedTypeSignatureParameters) | ||
| { | ||
| Map<TypeSignature, TypeSignature> typeSignatureMap = getTypeSignatureMap(actualTypeSignatureParameters, expectedTypeSignatureParameters); | ||
| return resolveTypeSignatures(actualTypeSignature, typeSignatureMap).getTypeSignature(); | ||
| } | ||
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| private static Map<TypeSignature, TypeSignature> getTypeSignatureMap(List<TypeSignature> parameters, List<TypeSignature> argumentTypes) | ||
| { | ||
| Map<TypeSignature, TypeSignature> typeSignatureMap = new HashMap<>(); | ||
| if (argumentTypes.size() != parameters.size()) { | ||
| throw new IllegalStateException( | ||
| "Parameters size: " + parameters.size() + " and argumentTypes size: " + argumentTypes.size() + " do not match !"); | ||
| } | ||
|
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| for (int i = 0; i < argumentTypes.size(); i++) { | ||
| TypeSignature parameter = parameters.get(i); | ||
| TypeSignature argumentType = argumentTypes.get(i); | ||
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| // Realistically, there are only two cases, | ||
| // 1. When parameter.getParameters() is empty : | ||
| // - Eg: parameter type = generic type(T) and argumentType = array(double), we can directly put | ||
| // map.put(parameter, argumentType) there is no need to loop over the argumentType. | ||
| // - Eg: param type = non-generic type(bigint) , in this case argumentType will also be of the | ||
| // same non-generic type hence map.put(parameter, argumentType) is valid here too. | ||
| // 2. When parameter.getParameters() is not empty: | ||
| // - Eg: parameter type = generic type (array(T)) and argumentType = array(double), we recursively run | ||
| // this function until we reach condition 1. | ||
| // Example calls for parameter type = generic type (array(T)) and argumentType = array(double) | ||
| // Iteration 1: | ||
| // Parameter: | ||
| // Type signature base = array | ||
| // parameters = T | ||
| // ArgumentType : | ||
| // Type signature base = array | ||
| // parameters = double | ||
| // Iteration 2: | ||
| // Parameter: | ||
| // Type signature base = T | ||
| // parameters = empty | ||
| // ArgumentType : | ||
| // Type signature base = double | ||
| // parameters = empty | ||
| // return typeSignatureMap = {"T": "double"} | ||
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| // If parameter params are of type long e.g decimal(15, 2) or | ||
| // of type varchar e.g decimal(i4, i5), we don't need to recursively call the function on its params | ||
| if (parameter.getParameters().isEmpty() || !(areParametersTypeSignatureOrNamedTypedSignature(parameter.getParameters()))) { | ||
| typeSignatureMap.put(parameter, argumentType); | ||
| } | ||
| else { | ||
| typeSignatureMap.putAll(getTypeSignatureMap( | ||
| parameter.getTypeOrNamedTypeParametersAsTypeSignatures(), | ||
| argumentType.getTypeOrNamedTypeParametersAsTypeSignatures())); | ||
| } | ||
| } | ||
| return typeSignatureMap; | ||
| } | ||
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| // A utility function to resolve intermediate type signatures. | ||
| // Realistically, these are the different cases that we can face: | ||
| // 1. If there are no params/argTypes in the first call itself, return the resolvedType from the map directly. | ||
| // 2. If params != empty, we loop over the params: | ||
| // - Check whether the param is present in the typeSignatureMap, if its present, | ||
| // add the resolvedTypeParameterSignature mapping as a param directly and continue to the next param. | ||
| // - The idea behind this logic is that if param type is present in the typeSignatureMap, it means that for | ||
| // that particular param, we could just resolve the type from the map and no need to recursively call as its completely resolved. | ||
| // - Eg: param : T , map : {"T":"array(double)"}. | ||
| // - If the mapping isn't present, we recursively call the resolveTypeSignatures() again. | ||
| // - Example calls for param: array(T) , map : {"T" : "array(double)"} | ||
| // resolvedIntermediateType = null | ||
| // Iteration 1: | ||
| // Parameter: | ||
| // key to lookup in map: array(T), key found : false | ||
| // Iteration 2: | ||
| // Parameter: | ||
| // key to lookup in map: T, key found : true | ||
| // resolvedIntermediateType = array(double) | ||
| // return resolvedIntermediateType = array(array(double)) | ||
| // | ||
| // | ||
| private static NamedTypeSignature resolveTypeSignatures(TypeSignature typeSignature, Map<TypeSignature, TypeSignature> typeSignatureMap) | ||
| { | ||
| if (typeSignatureMap.containsKey(typeSignature)) { | ||
| TypeSignature resolvedTypeSignature = typeSignatureMap.get(typeSignature); | ||
| return new NamedTypeSignature(Optional.empty(), resolvedTypeSignature); | ||
| } | ||
| List<NamedTypeSignature> namedTypeSignatures = new ArrayList<>(); | ||
| List<TypeSignature> typeSignatures = new ArrayList<>(); | ||
| for (TypeSignature typeParameterSignature : typeSignature.getTypeOrNamedTypeParametersAsTypeSignatures()) { | ||
| // if base is "row" typeSignature, all typeParameterSignatures need to be of type NamedTypeSignature. | ||
| boolean isRowTypeSignatureBase = typeSignature.getBase().equals("row"); | ||
| if (typeSignatureMap.containsKey(typeParameterSignature)) { | ||
| TypeSignature resolvedTypeParameterSignature = typeSignatureMap.get(typeParameterSignature); | ||
| if (isRowTypeSignatureBase) { | ||
| namedTypeSignatures.add(new NamedTypeSignature(Optional.empty(), resolvedTypeParameterSignature)); | ||
| } | ||
| else { | ||
| typeSignatures.add(resolvedTypeParameterSignature); | ||
| } | ||
| } | ||
| else { | ||
| NamedTypeSignature namedTypeSignature = resolveTypeSignatures(typeParameterSignature, typeSignatureMap); | ||
| if (isRowTypeSignatureBase) { | ||
| namedTypeSignatures.add(namedTypeSignature); | ||
| } | ||
| else { | ||
| typeSignatures.add(namedTypeSignature.getTypeSignature()); | ||
| } | ||
| } | ||
| } | ||
|
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| List<TypeSignatureParameter> parameters; | ||
| if (!typeSignatures.isEmpty()) { | ||
| parameters = typeSignatures.stream().map(TypeSignatureParameter::of).collect(Collectors.toList()); | ||
| } | ||
| else { | ||
| parameters = namedTypeSignatures.stream().map(TypeSignatureParameter::of).collect(Collectors.toList()); | ||
| } | ||
|
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| return new NamedTypeSignature(Optional.empty(), new TypeSignature(typeSignature.getBase(), unmodifiableList(parameters))); | ||
| } | ||
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| private static boolean areParametersTypeSignatureOrNamedTypedSignature(List<TypeSignatureParameter> parameters) | ||
| { | ||
| return !parameters.isEmpty() && parameters.stream() | ||
| .map(TypeSignatureParameter::getKind) | ||
| .allMatch(parameterKind -> | ||
| parameterKind.equals(ParameterKind.NAMED_TYPE) || parameterKind.equals(ParameterKind.TYPE)); | ||
| } | ||
| } |
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