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// 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.
#include "arrow/array/builder_dict.h"
#include <cstdint>
#include <utility>
#include "arrow/array/dict_internal.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"
#include "arrow/visit_type_inline.h"
namespace arrow20 {
// ----------------------------------------------------------------------
// DictionaryBuilder
namespace internal {
class DictionaryMemoTable::DictionaryMemoTableImpl {
// Type-dependent visitor for memo table initialization
struct MemoTableInitializer {
std::shared_ptr<DataType> value_type_;
MemoryPool* pool_;
std::unique_ptr<MemoTable>* memo_table_;
template <typename T>
enable_if_no_memoize<T, Status> Visit(const T&) {
return Status::NotImplemented("Initialization of ", value_type_->ToString(),
" memo table is not implemented");
}
template <typename T>
enable_if_memoize<T, Status> Visit(const T&) {
using MemoTable = typename DictionaryTraits<T>::MemoTableType;
memo_table_->reset(new MemoTable(pool_, 0));
return Status::OK();
}
};
// Type-dependent visitor for memo table insertion
struct ArrayValuesInserter {
DictionaryMemoTableImpl* impl_;
const Array& values_;
template <typename T>
Status Visit(const T& type) {
using ArrayType = typename TypeTraits<T>::ArrayType;
return InsertValues(type, checked_cast<const ArrayType&>(values_));
}
private:
template <typename T, typename ArrayType>
enable_if_no_memoize<T, Status> InsertValues(const T& type, const ArrayType&) {
return Status::NotImplemented("Inserting array values of ", type,
" is not implemented");
}
template <typename T, typename ArrayType>
enable_if_memoize<T, Status> InsertValues(const T&, const ArrayType& array) {
if (array.null_count() > 0) {
return Status::Invalid("Cannot insert dictionary values containing nulls");
}
for (int64_t i = 0; i < array.length(); ++i) {
int32_t unused_memo_index;
RETURN_NOT_OK(impl_->GetOrInsert<T>(array.GetView(i), &unused_memo_index));
}
return Status::OK();
}
};
// Type-dependent visitor for building ArrayData from memo table
struct ArrayDataGetter {
std::shared_ptr<DataType> value_type_;
MemoTable* memo_table_;
MemoryPool* pool_;
int64_t start_offset_;
std::shared_ptr<ArrayData>* out_;
template <typename T>
enable_if_no_memoize<T, Status> Visit(const T&) {
return Status::NotImplemented("Getting array data of ", value_type_,
" is not implemented");
}
template <typename T>
enable_if_memoize<T, Status> Visit(const T&) {
using ConcreteMemoTable = typename DictionaryTraits<T>::MemoTableType;
auto memo_table = checked_cast<ConcreteMemoTable*>(memo_table_);
ARROW_ASSIGN_OR_RAISE(*out_, DictionaryTraits<T>::GetDictionaryArrayData(
pool_, value_type_, *memo_table, start_offset_));
return Status::OK();
}
};
public:
DictionaryMemoTableImpl(MemoryPool* pool, std::shared_ptr<DataType> type)
: pool_(pool), type_(std::move(type)), memo_table_(nullptr) {
MemoTableInitializer visitor{type_, pool_, &memo_table_};
ARROW_CHECK_OK(VisitTypeInline(*type_, &visitor));
}
Status InsertValues(const Array& array) {
if (!array.type()->Equals(*type_)) {
return Status::Invalid("Array value type does not match memo type: ",
array.type()->ToString());
}
ArrayValuesInserter visitor{this, array};
return VisitTypeInline(*array.type(), &visitor);
}
template <typename PhysicalType,
typename CType = typename DictionaryValue<PhysicalType>::type>
Status GetOrInsert(CType value, int32_t* out) {
using ConcreteMemoTable = typename DictionaryTraits<PhysicalType>::MemoTableType;
return checked_cast<ConcreteMemoTable*>(memo_table_.get())->GetOrInsert(value, out);
}
Status GetArrayData(int64_t start_offset, std::shared_ptr<ArrayData>* out) {
ArrayDataGetter visitor{type_, memo_table_.get(), pool_, start_offset, out};
return VisitTypeInline(*type_, &visitor);
}
int32_t size() const { return memo_table_->size(); }
private:
MemoryPool* pool_;
std::shared_ptr<DataType> type_;
std::unique_ptr<MemoTable> memo_table_;
};
DictionaryMemoTable::DictionaryMemoTable(MemoryPool* pool,
const std::shared_ptr<DataType>& type)
: impl_(new DictionaryMemoTableImpl(pool, type)) {}
DictionaryMemoTable::DictionaryMemoTable(MemoryPool* pool,
const std::shared_ptr<Array>& dictionary)
: impl_(new DictionaryMemoTableImpl(pool, dictionary->type())) {
ARROW_CHECK_OK(impl_->InsertValues(*dictionary));
}
DictionaryMemoTable::~DictionaryMemoTable() = default;
#define GET_OR_INSERT(ARROW_TYPE) \
Status DictionaryMemoTable::GetOrInsert( \
const ARROW_TYPE*, typename ARROW_TYPE::c_type value, int32_t* out) { \
return impl_->GetOrInsert<ARROW_TYPE>(value, out); \
}
GET_OR_INSERT(BooleanType)
GET_OR_INSERT(Int8Type)
GET_OR_INSERT(Int16Type)
GET_OR_INSERT(Int32Type)
GET_OR_INSERT(Int64Type)
GET_OR_INSERT(UInt8Type)
GET_OR_INSERT(UInt16Type)
GET_OR_INSERT(UInt32Type)
GET_OR_INSERT(UInt64Type)
GET_OR_INSERT(FloatType)
GET_OR_INSERT(DoubleType)
GET_OR_INSERT(DurationType);
GET_OR_INSERT(TimestampType);
GET_OR_INSERT(Date32Type);
GET_OR_INSERT(Date64Type);
GET_OR_INSERT(Time32Type);
GET_OR_INSERT(Time64Type);
GET_OR_INSERT(MonthDayNanoIntervalType);
GET_OR_INSERT(DayTimeIntervalType);
GET_OR_INSERT(MonthIntervalType);
#undef GET_OR_INSERT
Status DictionaryMemoTable::GetOrInsert(const BinaryType*, std::string_view value,
int32_t* out) {
return impl_->GetOrInsert<BinaryType>(value, out);
}
Status DictionaryMemoTable::GetOrInsert(const BinaryViewType*, std::string_view value,
int32_t* out) {
// Create BinaryArray dictionary for now
return impl_->GetOrInsert<BinaryType>(value, out);
}
Status DictionaryMemoTable::GetOrInsert(const LargeBinaryType*, std::string_view value,
int32_t* out) {
return impl_->GetOrInsert<LargeBinaryType>(value, out);
}
Status DictionaryMemoTable::GetArrayData(int64_t start_offset,
std::shared_ptr<ArrayData>* out) {
return impl_->GetArrayData(start_offset, out);
}
Status DictionaryMemoTable::InsertValues(const Array& array) {
return impl_->InsertValues(array);
}
int32_t DictionaryMemoTable::size() const { return impl_->size(); }
} // namespace internal
} // namespace arrow20
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