]>
Commit | Line | Data |
---|---|---|
1d09f67e TL |
1 | // Licensed to the Apache Software Foundation (ASF) under one |
2 | // or more contributor license agreements. See the NOTICE file | |
3 | // distributed with this work for additional information | |
4 | // regarding copyright ownership. The ASF licenses this file | |
5 | // to you under the Apache License, Version 2.0 (the | |
6 | // "License"); you may not use this file except in compliance | |
7 | // with the License. You may obtain a copy of the License at | |
8 | // | |
9 | // http://www.apache.org/licenses/LICENSE-2.0 | |
10 | // | |
11 | // Unless required by applicable law or agreed to in writing, | |
12 | // software distributed under the License is distributed on an | |
13 | // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |
14 | // KIND, either express or implied. See the License for the | |
15 | // specific language governing permissions and limitations | |
16 | // under the License. | |
17 | ||
18 | //----------------------------------------------------------------------------- | |
19 | // MurmurHash3 was written by Austin Appleby, and is placed in the public | |
20 | // domain. The author hereby disclaims copyright to this source code. | |
21 | ||
22 | #pragma once | |
23 | ||
24 | #include <cstdint> | |
25 | ||
26 | #include "parquet/hasher.h" | |
27 | #include "parquet/platform.h" | |
28 | #include "parquet/types.h" | |
29 | ||
30 | namespace parquet { | |
31 | ||
32 | /// Source: | |
33 | /// https://github.com/aappleby/smhasher/blob/master/src/MurmurHash3.cpp | |
34 | /// (Modified to adapt to coding conventions and to inherit the Hasher abstract class) | |
35 | class PARQUET_EXPORT MurmurHash3 : public Hasher { | |
36 | public: | |
37 | MurmurHash3() : seed_(DEFAULT_SEED) {} | |
38 | uint64_t Hash(int32_t value) const override; | |
39 | uint64_t Hash(int64_t value) const override; | |
40 | uint64_t Hash(float value) const override; | |
41 | uint64_t Hash(double value) const override; | |
42 | uint64_t Hash(const Int96* value) const override; | |
43 | uint64_t Hash(const ByteArray* value) const override; | |
44 | uint64_t Hash(const FLBA* val, uint32_t len) const override; | |
45 | ||
46 | private: | |
47 | // Default seed for hash which comes from Bloom filter in parquet-mr, it is generated | |
48 | // by System.nanoTime() of java. | |
49 | static constexpr int DEFAULT_SEED = 1361930890; | |
50 | ||
51 | uint32_t seed_; | |
52 | }; | |
53 | ||
54 | } // namespace parquet |