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89 lines
2.6 KiB
C++
89 lines
2.6 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#pragma once
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#include <memory>
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#include <type_traits>
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#include "arrow/status.h"
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#include "arrow/type.h"
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#include "arrow/type_traits.h"
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#include "arrow/util/visibility.h"
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namespace arrow {
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class Array;
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class DataType;
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namespace compute {
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struct Datum;
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class FunctionContext;
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class AggregateFunction;
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/// \class CountOptions
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///
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/// The user control the Count kernel behavior with this class. By default, the
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/// it will count all non-null values.
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struct ARROW_EXPORT CountOptions {
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enum mode {
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// Count all non-null values.
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COUNT_ALL = 0,
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// Count all null values.
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COUNT_NULL,
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};
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explicit CountOptions(enum mode count_mode) : count_mode(count_mode) {}
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enum mode count_mode = COUNT_ALL;
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};
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/// \brief Return Count function aggregate
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ARROW_EXPORT
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std::shared_ptr<AggregateFunction> MakeCount(FunctionContext* context,
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const CountOptions& options);
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/// \brief Count non-null (or null) values in an array.
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///
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/// \param[in] context the FunctionContext
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/// \param[in] options counting options, see CountOptions for more information
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/// \param[in] datum to count
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/// \param[out] out resulting datum
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///
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/// \since 0.13.0
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/// \note API not yet finalized
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ARROW_EXPORT
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Status Count(FunctionContext* context, const CountOptions& options, const Datum& datum,
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Datum* out);
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/// \brief Count non-null (or null) values in an array.
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///
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/// \param[in] context the FunctionContext
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/// \param[in] options counting options, see CountOptions for more information
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/// \param[in] array to count
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/// \param[out] out resulting datum
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///
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/// \since 0.13.0
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/// \note API not yet finalized
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ARROW_EXPORT
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Status Count(FunctionContext* context, const CountOptions& options, const Array& array,
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Datum* out);
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} // namespace compute
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} // namespace arrow
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