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55 lines
2.0 KiB
C++
55 lines
2.0 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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//-----------------------------------------------------------------------------
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// MurmurHash3 was written by Austin Appleby, and is placed in the public
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// domain. The author hereby disclaims copyright to this source code.
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#pragma once
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#include <cstdint>
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#include "parquet/hasher.h"
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#include "parquet/platform.h"
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#include "parquet/types.h"
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namespace parquet {
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/// Source:
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/// https://github.com/aappleby/smhasher/blob/master/src/MurmurHash3.cpp
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/// (Modified to adapt to coding conventions and to inherit the Hasher abstract class)
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class PARQUET_EXPORT MurmurHash3 : public Hasher {
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public:
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MurmurHash3() : seed_(DEFAULT_SEED) {}
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uint64_t Hash(int32_t value) const override;
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uint64_t Hash(int64_t value) const override;
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uint64_t Hash(float value) const override;
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uint64_t Hash(double value) const override;
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uint64_t Hash(const Int96* value) const override;
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uint64_t Hash(const ByteArray* value) const override;
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uint64_t Hash(const FLBA* val, uint32_t len) const override;
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private:
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// Default seed for hash which comes from Bloom filter in parquet-mr, it is generated
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// by System.nanoTime() of java.
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static constexpr int DEFAULT_SEED = 1361930890;
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uint32_t seed_;
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};
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} // namespace parquet
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