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174 lines (148 loc) · 5.71 KB
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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_nested.h"
#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <cstring>
#include <sstream>
#include <utility>
#include <vector>
#include "arrow/array.h"
#include "arrow/buffer.h"
#include "arrow/status.h"
#include "arrow/type.h"
#include "arrow/type_traits.h"
#include "arrow/util/bit-util.h"
#include "arrow/util/int-util.h"
#include "arrow/util/logging.h"
namespace arrow {
// ----------------------------------------------------------------------
// ListBuilder
ListBuilder::ListBuilder(MemoryPool* pool,
std::shared_ptr<ArrayBuilder> const& value_builder,
const std::shared_ptr<DataType>& type)
: ArrayBuilder(type ? type
: std::static_pointer_cast<DataType>(
std::make_shared<ListType>(value_builder->type())),
pool),
offsets_builder_(pool),
value_builder_(value_builder) {}
Status ListBuilder::AppendValues(const int32_t* offsets, int64_t length,
const uint8_t* valid_bytes) {
RETURN_NOT_OK(Reserve(length));
UnsafeAppendToBitmap(valid_bytes, length);
offsets_builder_.UnsafeAppend(offsets, length);
return Status::OK();
}
Status ListBuilder::AppendNextOffset() {
const int64_t num_values = value_builder_->length();
ARROW_RETURN_IF(
num_values > kListMaximumElements,
Status::CapacityError("ListArray cannot contain more then 2^31 - 1 child elements,",
" have ", num_values));
return offsets_builder_.Append(static_cast<int32_t>(num_values));
}
Status ListBuilder::Append(bool is_valid) {
RETURN_NOT_OK(Reserve(1));
UnsafeAppendToBitmap(is_valid);
return AppendNextOffset();
}
Status ListBuilder::Resize(int64_t capacity) {
DCHECK_LE(capacity, kListMaximumElements);
RETURN_NOT_OK(CheckCapacity(capacity, capacity_));
// one more then requested for offsets
RETURN_NOT_OK(offsets_builder_.Resize(capacity + 1));
return ArrayBuilder::Resize(capacity);
}
Status ListBuilder::FinishInternal(std::shared_ptr<ArrayData>* out) {
RETURN_NOT_OK(AppendNextOffset());
// Offset padding zeroed by BufferBuilder
std::shared_ptr<Buffer> offsets;
RETURN_NOT_OK(offsets_builder_.Finish(&offsets));
std::shared_ptr<ArrayData> items;
if (values_) {
items = values_->data();
} else {
if (value_builder_->length() == 0) {
// Try to make sure we get a non-null values buffer (ARROW-2744)
RETURN_NOT_OK(value_builder_->Resize(0));
}
RETURN_NOT_OK(value_builder_->FinishInternal(&items));
}
// If the type has not been specified in the constructor, infer it
// This is the case if the value_builder contains a DenseUnionBuilder
if (!arrow::internal::checked_cast<ListType&>(*type_).value_type()) {
type_ = std::static_pointer_cast<DataType>(
std::make_shared<ListType>(value_builder_->type()));
}
std::shared_ptr<Buffer> null_bitmap;
RETURN_NOT_OK(null_bitmap_builder_.Finish(&null_bitmap));
*out = ArrayData::Make(type_, length_, {null_bitmap, offsets}, null_count_);
(*out)->child_data.emplace_back(std::move(items));
Reset();
return Status::OK();
}
void ListBuilder::Reset() {
ArrayBuilder::Reset();
values_.reset();
offsets_builder_.Reset();
value_builder_->Reset();
}
ArrayBuilder* ListBuilder::value_builder() const {
DCHECK(!values_) << "Using value builder is pointless when values_ is set";
return value_builder_.get();
}
// ----------------------------------------------------------------------
// Struct
StructBuilder::StructBuilder(const std::shared_ptr<DataType>& type, MemoryPool* pool,
std::vector<std::shared_ptr<ArrayBuilder>>&& field_builders)
: ArrayBuilder(type, pool) {
children_ = std::move(field_builders);
}
void StructBuilder::Reset() {
ArrayBuilder::Reset();
for (const auto& field_builder : children_) {
field_builder->Reset();
}
}
Status StructBuilder::FinishInternal(std::shared_ptr<ArrayData>* out) {
std::shared_ptr<Buffer> null_bitmap;
RETURN_NOT_OK(null_bitmap_builder_.Finish(&null_bitmap));
std::vector<std::shared_ptr<ArrayData>> child_data(children_.size());
for (size_t i = 0; i < children_.size(); ++i) {
if (length_ == 0) {
// Try to make sure the child buffers are initialized
RETURN_NOT_OK(children_[i]->Resize(0));
}
RETURN_NOT_OK(children_[i]->FinishInternal(&child_data[i]));
}
// If the type has not been specified in the constructor, infer it
// This is the case if one of the children contains a DenseUnionBuilder
if (!type_) {
std::vector<std::shared_ptr<Field>> fields;
for (const auto& field_builder : children_) {
fields.push_back(field("", field_builder->type()));
}
type_ = struct_(fields);
}
*out = ArrayData::Make(type_, length_, {null_bitmap}, null_count_);
(*out)->child_data = std::move(child_data);
capacity_ = length_ = null_count_ = 0;
return Status::OK();
}
} // namespace arrow