1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
#pragma clang system_header
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
#pragma once
#include "arrow/array/builder_dict.h"
#include <cstdint>
#include <limits>
#include <memory>
#include <string_view>
#include <type_traits>
#include <utility>
#include <vector>
#include "arrow/array.h"
#include "arrow/buffer.h"
#include "arrow/result.h"
#include "arrow/status.h"
#include "arrow/type.h"
#include "arrow/type_traits.h"
#include "arrow/util/checked_cast.h"
#include "arrow/util/hashing.h"
#include "arrow/util/logging.h"
namespace arrow20 {
namespace internal {
template <typename T, typename Enable = void>
struct DictionaryTraits {
using MemoTableType = void;
};
} // namespace internal
template <typename T, typename Out = void>
using enable_if_memoize = enable_if_t<
!std::is_same<typename internal::DictionaryTraits<T>::MemoTableType, void>::value,
Out>;
template <typename T, typename Out = void>
using enable_if_no_memoize = enable_if_t<
std::is_same<typename internal::DictionaryTraits<T>::MemoTableType, void>::value,
Out>;
namespace internal {
template <>
struct DictionaryTraits<BooleanType> {
using T = BooleanType;
using MemoTableType = typename HashTraits<T>::MemoTableType;
static Result<std::shared_ptr<ArrayData>> GetDictionaryArrayData(
MemoryPool* pool, const std::shared_ptr<DataType>& type,
const MemoTableType& memo_table, int64_t start_offset) {
if (start_offset < 0) {
return Status::Invalid("invalid start_offset ", start_offset);
}
BooleanBuilder builder(pool);
const auto& bool_values = memo_table.values();
const auto null_index = memo_table.GetNull();
// Will iterate up to 3 times.
for (int64_t i = start_offset; i < memo_table.size(); i++) {
RETURN_NOT_OK(i == null_index ? builder.AppendNull()
: builder.Append(bool_values[i]));
}
std::shared_ptr<ArrayData> out;
RETURN_NOT_OK(builder.FinishInternal(&out));
return out;
}
}; // namespace internal
template <typename T>
struct DictionaryTraits<T, enable_if_has_c_type<T>> {
using c_type = typename T::c_type;
using MemoTableType = typename HashTraits<T>::MemoTableType;
static Result<std::shared_ptr<ArrayData>> GetDictionaryArrayData(
MemoryPool* pool, const std::shared_ptr<DataType>& type,
const MemoTableType& memo_table, int64_t start_offset) {
auto dict_length = static_cast<int64_t>(memo_table.size()) - start_offset;
// This makes a copy, but we assume a dictionary array is usually small
// compared to the size of the dictionary-using array.
// (also, copying the dictionary values is cheap compared to the cost
// of building the memo table)
ARROW_ASSIGN_OR_RAISE(
std::shared_ptr<Buffer> dict_buffer,
AllocateBuffer(TypeTraits<T>::bytes_required(dict_length), pool));
memo_table.CopyValues(static_cast<int32_t>(start_offset),
reinterpret_cast<c_type*>(dict_buffer->mutable_data()));
int64_t null_count = 0;
std::shared_ptr<Buffer> null_bitmap = nullptr;
RETURN_NOT_OK(
ComputeNullBitmap(pool, memo_table, start_offset, &null_count, &null_bitmap));
return ArrayData::Make(type, dict_length, {null_bitmap, dict_buffer}, null_count);
}
};
template <typename T>
struct DictionaryTraits<T, enable_if_base_binary<T>> {
using MemoTableType = typename HashTraits<T>::MemoTableType;
static Result<std::shared_ptr<ArrayData>> GetDictionaryArrayData(
MemoryPool* pool, const std::shared_ptr<DataType>& type,
const MemoTableType& memo_table, int64_t start_offset) {
using offset_type = typename T::offset_type;
// Create the offsets buffer
auto dict_length = static_cast<int64_t>(memo_table.size() - start_offset);
ARROW_ASSIGN_OR_RAISE(auto dict_offsets,
AllocateBuffer(sizeof(offset_type) * (dict_length + 1), pool));
auto raw_offsets = reinterpret_cast<offset_type*>(dict_offsets->mutable_data());
memo_table.CopyOffsets(static_cast<int32_t>(start_offset), raw_offsets);
// Create the data buffer
auto values_size = memo_table.values_size();
ARROW_ASSIGN_OR_RAISE(auto dict_data, AllocateBuffer(values_size, pool));
if (values_size > 0) {
memo_table.CopyValues(static_cast<int32_t>(start_offset), dict_data->size(),
dict_data->mutable_data());
}
int64_t null_count = 0;
std::shared_ptr<Buffer> null_bitmap = nullptr;
RETURN_NOT_OK(
ComputeNullBitmap(pool, memo_table, start_offset, &null_count, &null_bitmap));
return ArrayData::Make(type, dict_length,
{null_bitmap, std::move(dict_offsets), std::move(dict_data)},
null_count);
}
};
template <typename T>
struct DictionaryTraits<T, enable_if_binary_view_like<T>> {
using MemoTableType = typename HashTraits<T>::MemoTableType;
static_assert(std::is_same_v<MemoTableType, BinaryMemoTable<BinaryBuilder>>);
// Instead of defining a custom memo table for StringView we reuse BinaryType's,
// then convert to views when we copy data out of the memo table.
static Result<std::shared_ptr<ArrayData>> GetDictionaryArrayData(
MemoryPool* pool, const std::shared_ptr<DataType>& type,
const MemoTableType& memo_table, int64_t start_offset) {
DCHECK(type->id() == Type::STRING_VIEW || type->id() == Type::BINARY_VIEW);
BinaryViewBuilder builder(pool);
RETURN_NOT_OK(builder.Resize(memo_table.size() - start_offset));
RETURN_NOT_OK(builder.ReserveData(memo_table.values_size()));
memo_table.VisitValues(static_cast<int32_t>(start_offset),
[&](std::string_view s) { builder.UnsafeAppend(s); });
std::shared_ptr<ArrayData> out;
RETURN_NOT_OK(builder.FinishInternal(&out));
out->type = type;
return out;
}
};
template <typename T>
struct DictionaryTraits<T, enable_if_fixed_size_binary<T>> {
using MemoTableType = typename HashTraits<T>::MemoTableType;
static Result<std::shared_ptr<ArrayData>> GetDictionaryArrayData(
MemoryPool* pool, const std::shared_ptr<DataType>& type,
const MemoTableType& memo_table, int64_t start_offset) {
const T& concrete_type = internal::checked_cast<const T&>(*type);
// Create the data buffer
auto dict_length = static_cast<int64_t>(memo_table.size() - start_offset);
auto width_length = concrete_type.byte_width();
auto data_length = dict_length * width_length;
ARROW_ASSIGN_OR_RAISE(auto dict_data, AllocateBuffer(data_length, pool));
auto data = dict_data->mutable_data();
memo_table.CopyFixedWidthValues(static_cast<int32_t>(start_offset), width_length,
data_length, data);
int64_t null_count = 0;
std::shared_ptr<Buffer> null_bitmap = nullptr;
RETURN_NOT_OK(
ComputeNullBitmap(pool, memo_table, start_offset, &null_count, &null_bitmap));
return ArrayData::Make(type, dict_length, {null_bitmap, std::move(dict_data)},
null_count);
}
};
} // namespace internal
} // namespace arrow20
|
