| /** |
| * 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. |
| **/ |
| |
| #include "expressions/aggregation/AggregateFunctionMin.hpp" |
| |
| #include <vector> |
| |
| #include "expressions/aggregation/AggregationHandleMin.hpp" |
| #include "types/Type.hpp" |
| #include "types/operations/comparisons/Comparison.hpp" |
| #include "types/operations/comparisons/ComparisonFactory.hpp" |
| #include "types/operations/comparisons/ComparisonID.hpp" |
| |
| #include "glog/logging.h" |
| |
| namespace quickstep { |
| |
| bool AggregateFunctionMin::canApplyToTypes( |
| const std::vector<const Type*> &argument_types) const { |
| // MIN is unary. |
| if (argument_types.size() != 1) { |
| return false; |
| } |
| |
| // Argument must be comparable by '<'. |
| return ComparisonFactory::GetComparison(ComparisonID::kLess).canCompareTypes( |
| *argument_types.front(), |
| *argument_types.front()); |
| } |
| |
| const Type* AggregateFunctionMin::resultTypeForArgumentTypes( |
| const std::vector<const Type*> &argument_types) const { |
| if (!canApplyToTypes(argument_types)) { |
| return nullptr; |
| } |
| |
| return &(argument_types.front()->getNullableVersion()); |
| } |
| |
| AggregationHandle* AggregateFunctionMin::createHandle( |
| const std::vector<const Type*> &argument_types) const { |
| DCHECK(canApplyToTypes(argument_types)) |
| << "Attempted to create an AggregationHandleMin for argument Type(s) " |
| << "that MIN can not be applied to."; |
| |
| return new AggregationHandleMin(*argument_types.front()); |
| } |
| |
| } // namespace quickstep |