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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 | #pragma once | |
19 | ||
20 | #include <memory> | |
21 | #include <random> | |
22 | ||
23 | #include "arrow/status.h" | |
24 | #include "arrow/util/io_util.h" | |
25 | ||
26 | #include "gandiva/function_holder.h" | |
27 | #include "gandiva/node.h" | |
28 | #include "gandiva/visibility.h" | |
29 | ||
30 | namespace gandiva { | |
31 | ||
32 | /// Function Holder for 'random' | |
33 | class GANDIVA_EXPORT RandomGeneratorHolder : public FunctionHolder { | |
34 | public: | |
35 | ~RandomGeneratorHolder() override = default; | |
36 | ||
37 | static Status Make(const FunctionNode& node, | |
38 | std::shared_ptr<RandomGeneratorHolder>* holder); | |
39 | ||
40 | double operator()() { return distribution_(generator_); } | |
41 | ||
42 | private: | |
43 | explicit RandomGeneratorHolder(int seed) : distribution_(0, 1) { | |
44 | int64_t seed64 = static_cast<int64_t>(seed); | |
45 | seed64 = (seed64 ^ 0x00000005DEECE66D) & 0x0000ffffffffffff; | |
46 | generator_.seed(static_cast<uint64_t>(seed64)); | |
47 | } | |
48 | ||
49 | RandomGeneratorHolder() : distribution_(0, 1) { | |
50 | generator_.seed(::arrow::internal::GetRandomSeed()); | |
51 | } | |
52 | ||
53 | std::mt19937_64 generator_; | |
54 | std::uniform_real_distribution<> distribution_; | |
55 | }; | |
56 | ||
57 | } // namespace gandiva |