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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/array_run_end.h"
#include "arrow/array/builder_primitive.h"
#include "arrow/array/util.h"
#include "arrow/util/logging.h"
#include "arrow/util/ree_util.h"
namespace arrow20 {
// ----------------------------------------------------------------------
// RunEndEncodedArray
RunEndEncodedArray::RunEndEncodedArray(const std::shared_ptr<ArrayData>& data) {
this->SetData(data);
}
RunEndEncodedArray::RunEndEncodedArray(const std::shared_ptr<DataType>& type,
int64_t length,
const std::shared_ptr<Array>& run_ends,
const std::shared_ptr<Array>& values,
int64_t offset) {
this->SetData(ArrayData::Make(type, length,
/*buffers=*/{NULLPTR},
/*child_data=*/{run_ends->data(), values->data()},
/*null_count=*/0, offset));
}
Result<std::shared_ptr<RunEndEncodedArray>> RunEndEncodedArray::Make(
const std::shared_ptr<DataType>& type, int64_t logical_length,
const std::shared_ptr<Array>& run_ends, const std::shared_ptr<Array>& values,
int64_t logical_offset) {
if (type->id() != Type::RUN_END_ENCODED) {
return Status::Invalid("Type must be RUN_END_ENCODED");
}
const auto* ree_type = internal::checked_cast<const RunEndEncodedType*>(type.get());
RETURN_NOT_OK(ree_util::ValidateRunEndEncodedChildren(
*ree_type, logical_length, run_ends->data(), values->data(), 0, logical_offset));
return std::make_shared<RunEndEncodedArray>(type, logical_length, run_ends, values,
logical_offset);
}
Result<std::shared_ptr<RunEndEncodedArray>> RunEndEncodedArray::Make(
int64_t logical_length, const std::shared_ptr<Array>& run_ends,
const std::shared_ptr<Array>& values, int64_t logical_offset) {
auto run_end_type = run_ends->type();
auto value_type = values->type();
if (!RunEndEncodedType::RunEndTypeValid(*run_end_type)) {
return Status::Invalid("Run end type must be int16, int32 or int64");
}
auto ree_type = run_end_encoded(std::move(run_end_type), std::move(value_type));
return Make(ree_type, logical_length, run_ends, values, logical_offset);
}
void RunEndEncodedArray::SetData(const std::shared_ptr<ArrayData>& data) {
ARROW_CHECK_EQ(data->type->id(), Type::RUN_END_ENCODED);
const auto* ree_type =
internal::checked_cast<const RunEndEncodedType*>(data->type.get());
ARROW_CHECK_EQ(data->child_data.size(), 2);
ARROW_CHECK_EQ(ree_type->run_end_type()->id(), data->child_data[0]->type->id());
ARROW_CHECK_EQ(ree_type->value_type()->id(), data->child_data[1]->type->id());
Array::SetData(data);
run_ends_array_ = MakeArray(this->data()->child_data[0]);
values_array_ = MakeArray(this->data()->child_data[1]);
}
namespace {
template <typename RunEndType>
Result<std::shared_ptr<Array>> MakeLogicalRunEnds(const RunEndEncodedArray& self,
MemoryPool* pool) {
using RunEndCType = typename RunEndType::c_type;
if (self.offset() == 0) {
const auto& run_ends = *self.run_ends();
if (self.length() == 0) {
return run_ends.Slice(0, 0);
}
// If offset==0 and the non-zero logical length aligns perfectly with a
// physical run-end, we can return a slice of the run-ends array.
const int64_t physical_length = self.FindPhysicalLength();
const auto* run_end_values = self.data()->child_data[0]->GetValues<RunEndCType>(1);
if (run_end_values[physical_length - 1] == self.length()) {
return run_ends.Slice(0, physical_length);
}
// Otherwise we need to copy the run-ends array and adjust only the very
// last run-end.
auto new_run_ends_data = ArrayData::Make(run_ends.type(), physical_length, 0, 0);
{
ARROW_ASSIGN_OR_RAISE(auto buffer,
AllocateBuffer(physical_length * sizeof(RunEndCType), pool));
new_run_ends_data->buffers = {NULLPTR, std::move(buffer)};
}
auto* new_run_end_values = new_run_ends_data->GetMutableValues<RunEndCType>(1);
memcpy(new_run_end_values, run_end_values,
(physical_length - 1) * sizeof(RunEndCType));
new_run_end_values[physical_length - 1] = static_cast<RunEndCType>(self.length());
return MakeArray(std::move(new_run_ends_data));
}
// When the logical offset is non-zero, all run-end values need to be adjusted.
int64_t physical_offset = self.FindPhysicalOffset();
int64_t physical_length = self.FindPhysicalLength();
const auto* run_end_values = self.data()->child_data[0]->GetValues<RunEndCType>(1);
NumericBuilder<RunEndType> builder(pool);
RETURN_NOT_OK(builder.Resize(physical_length));
if (physical_length > 0) {
for (int64_t i = 0; i < physical_length - 1; i++) {
const auto run_end = run_end_values[physical_offset + i] - self.offset();
DCHECK_LT(run_end, self.length());
RETURN_NOT_OK(builder.Append(static_cast<RunEndCType>(run_end)));
}
DCHECK_GE(run_end_values[physical_offset + physical_length - 1] - self.offset(),
self.length());
RETURN_NOT_OK(builder.Append(static_cast<RunEndCType>(self.length())));
}
return builder.Finish();
}
} // namespace
Result<std::shared_ptr<Array>> RunEndEncodedArray::LogicalRunEnds(
MemoryPool* pool) const {
DCHECK(data()->child_data[0]->buffers[1]->is_cpu());
switch (run_ends_array_->type_id()) {
case Type::INT16:
return MakeLogicalRunEnds<Int16Type>(*this, pool);
case Type::INT32:
return MakeLogicalRunEnds<Int32Type>(*this, pool);
default:
DCHECK_EQ(run_ends_array_->type_id(), Type::INT64);
return MakeLogicalRunEnds<Int64Type>(*this, pool);
}
}
std::shared_ptr<Array> RunEndEncodedArray::LogicalValues() const {
const int64_t physical_offset = FindPhysicalOffset();
const int64_t physical_length = FindPhysicalLength();
return MakeArray(data()->child_data[1]->Slice(physical_offset, physical_length));
}
int64_t RunEndEncodedArray::FindPhysicalOffset() const {
const ArraySpan span(*this->data_);
return ree_util::FindPhysicalIndex(span, 0, span.offset);
}
int64_t RunEndEncodedArray::FindPhysicalLength() const {
const ArraySpan span(*this->data_);
return ree_util::FindPhysicalLength(span);
}
} // namespace arrow20
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