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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 <utility> | |
22 | #include <vector> | |
23 | ||
24 | #include <arrow/util/logging.h> | |
25 | #include "gandiva/arrow.h" | |
26 | #include "gandiva/gandiva_aliases.h" | |
27 | ||
28 | namespace gandiva { | |
29 | ||
30 | /// \brief The buffers corresponding to one batch of records, used for | |
31 | /// expression evaluation. | |
32 | class LocalBitMapsHolder { | |
33 | public: | |
34 | LocalBitMapsHolder(int64_t num_records, int num_local_bitmaps); | |
35 | ||
36 | int GetNumLocalBitMaps() const { return static_cast<int>(local_bitmaps_vec_.size()); } | |
37 | ||
38 | int64_t GetLocalBitMapSize() const { return local_bitmap_size_; } | |
39 | ||
40 | uint8_t** GetLocalBitMapArray() const { return local_bitmaps_array_.get(); } | |
41 | ||
42 | uint8_t* GetLocalBitMap(int idx) const { | |
43 | DCHECK(idx <= GetNumLocalBitMaps()); | |
44 | return local_bitmaps_array_.get()[idx]; | |
45 | } | |
46 | ||
47 | private: | |
48 | /// number of records in the current batch. | |
49 | int64_t num_records_; | |
50 | ||
51 | /// A container of 'local_bitmaps_', each sized to accommodate 'num_records'. | |
52 | std::vector<std::unique_ptr<uint8_t[]>> local_bitmaps_vec_; | |
53 | ||
54 | /// An array of the local bitmaps. | |
55 | std::unique_ptr<uint8_t*[]> local_bitmaps_array_; | |
56 | ||
57 | int64_t local_bitmap_size_; | |
58 | }; | |
59 | ||
60 | inline LocalBitMapsHolder::LocalBitMapsHolder(int64_t num_records, int num_local_bitmaps) | |
61 | : num_records_(num_records) { | |
62 | // alloc an array for the pointers to the bitmaps. | |
63 | if (num_local_bitmaps > 0) { | |
64 | local_bitmaps_array_.reset(new uint8_t*[num_local_bitmaps]); | |
65 | } | |
66 | ||
67 | // 64-bit aligned bitmaps. | |
68 | int64_t roundUp64Multiple = (num_records_ + 63) >> 6; | |
69 | local_bitmap_size_ = roundUp64Multiple * 8; | |
70 | ||
71 | // Alloc 'num_local_bitmaps_' number of bitmaps, each of capacity 'num_records_'. | |
72 | for (int i = 0; i < num_local_bitmaps; ++i) { | |
73 | // TODO : round-up to a slab friendly multiple. | |
74 | std::unique_ptr<uint8_t[]> bitmap(new uint8_t[local_bitmap_size_]); | |
75 | ||
76 | // keep pointer to the bitmap in the array. | |
77 | (local_bitmaps_array_.get())[i] = bitmap.get(); | |
78 | ||
79 | // pre-fill with 1s (assuming that the probability of is_valid is higher). | |
80 | memset(bitmap.get(), 0xff, local_bitmap_size_); | |
81 | local_bitmaps_vec_.push_back(std::move(bitmap)); | |
82 | } | |
83 | } | |
84 | ||
85 | } // namespace gandiva |