| /** |
| * 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/window_aggregation/WindowAggregateFunctionCount.hpp" |
| |
| #include <vector> |
| |
| #include "expressions/window_aggregation/WindowAggregationHandle.hpp" |
| #include "types/Type.hpp" |
| #include "types/TypeFactory.hpp" |
| #include "types/TypeID.hpp" |
| |
| #include "glog/logging.h" |
| |
| namespace quickstep { |
| |
| bool WindowAggregateFunctionCount::canApplyToTypes( |
| const std::vector<const Type*> &argument_types) const { |
| // COUNT may be nullary (i.e. COUNT(*)) or unary. |
| return argument_types.size() <= 1; |
| } |
| |
| const Type* WindowAggregateFunctionCount::resultTypeForArgumentTypes( |
| const std::vector<const Type*> &argument_types) const { |
| if (!canApplyToTypes(argument_types)) { |
| return nullptr; |
| } |
| |
| return &TypeFactory::GetType(kLong); |
| } |
| |
| WindowAggregationHandle* WindowAggregateFunctionCount::createHandle( |
| const std::vector<const Type*> &argument_types, |
| const std::vector<std::unique_ptr<const Scalar>> &partition_by_attributes, |
| const std::vector<std::unique_ptr<const Scalar>> &order_by_attributes, |
| const bool is_row, |
| const std::int64_t num_preceding, |
| const std::int64_t num_following) const { |
| DCHECK(canApplyToTypes(argument_types)) |
| << "Attempted to create a WindowAggregationHandleCount for argument Types " |
| << "that COUNT can not be applied to (> 1 argument)."; |
| |
| // TODO(Shixuan): Add handle for Count. |
| return nullptr; |
| } |
| |
| } // namespace quickstep |