| /** |
| * Copyright 2015 Pivotal Software, Inc. |
| * |
| * 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. |
| **/ |
| |
| #include "expressions/aggregation/AggregateFunctionSum.hpp" |
| |
| #include <vector> |
| |
| #include "expressions/aggregation/AggregationHandleSum.hpp" |
| #include "types/Type.hpp" |
| #include "types/TypeFactory.hpp" |
| #include "types/TypeID.hpp" |
| #include "types/operations/binary_operations/BinaryOperation.hpp" |
| #include "types/operations/binary_operations/BinaryOperationFactory.hpp" |
| #include "types/operations/binary_operations/BinaryOperationID.hpp" |
| |
| #include "glog/logging.h" |
| |
| namespace quickstep { |
| |
| bool AggregateFunctionSum::canApplyToTypes( |
| const std::vector<const Type*> &argument_types) const { |
| // SUM is unary. |
| if (argument_types.size() != 1) { |
| return false; |
| } |
| |
| // Argument must be addable. |
| return BinaryOperationFactory::GetBinaryOperation(BinaryOperationID::kAdd) |
| .canApplyToTypes(*argument_types.front(), *argument_types.front()); |
| } |
| |
| const Type* AggregateFunctionSum::resultTypeForArgumentTypes( |
| const std::vector<const Type*> &argument_types) const { |
| if (!canApplyToTypes(argument_types)) { |
| return nullptr; |
| } |
| |
| // SUM may return NULL if there are no input rows, and we automatically widen |
| // int to long and float to double to have more headroom when adding up many |
| // values. |
| const Type *sum_type = &(argument_types.front()->getNullableVersion()); |
| switch (sum_type->getTypeID()) { |
| case kInt: |
| sum_type = &TypeFactory::GetType(kLong, true); |
| break; |
| case kFloat: |
| sum_type = &TypeFactory::GetType(kDouble, true); |
| break; |
| default: |
| break; |
| } |
| |
| return sum_type; |
| } |
| |
| AggregationHandle* AggregateFunctionSum::createHandle( |
| const std::vector<const Type*> &argument_types) const { |
| DCHECK(canApplyToTypes(argument_types)) |
| << "Attempted to create an AggregationHandleSum for argument Type(s) " |
| << "that SUM can not be applied to."; |
| |
| return new AggregationHandleSum(*argument_types.front()); |
| } |
| |
| } // namespace quickstep |