e412dd12e8
Currently, there are some useless includes in the codebase. We can use a tool named include-what-you-use to optimize these includes. By using a strict include-what-you-use policy, we can get lots of benefits from it.
72 lines
2.1 KiB
C++
72 lines
2.1 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 <stddef.h>
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#include <stdint.h>
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#include <algorithm>
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#include <memory>
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#include <vector>
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#include "slice.h"
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namespace doris {
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class TDigest;
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const static int QUANTILE_STATE_EXPLICIT_NUM = 2048;
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const static int QUANTILE_STATE_COMPRESSION_MIN = 2048;
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const static int QUANTILE_STATE_COMPRESSION_MAX = 10000;
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enum QuantileStateType {
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EMPTY = 0,
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SINGLE = 1, // single element
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EXPLICIT = 2, // more than one elements,stored in vector
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TDIGEST = 3 // TDIGEST object
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};
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template <typename T>
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class QuantileState {
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public:
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QuantileState();
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explicit QuantileState(float compression);
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explicit QuantileState(const Slice& slice);
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void set_compression(float compression);
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bool deserialize(const Slice& slice);
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size_t serialize(uint8_t* dst) const;
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void merge(const QuantileState<T>& other);
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void add_value(const T& value);
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void clear();
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bool is_valid(const Slice& slice);
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size_t get_serialized_size();
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T get_value_by_percentile(float percentile) const;
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T get_explicit_value_by_percentile(float percentile) const;
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~QuantileState() = default;
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private:
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QuantileStateType _type = EMPTY;
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std::shared_ptr<TDigest> _tdigest_ptr;
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T _single_data;
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std::vector<T> _explicit_data;
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float _compression;
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};
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using QuantileStateDouble = QuantileState<double>;
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} // namespace doris
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