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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 <cstdint>
#include <optional>
#include <utility>
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/array/data.h"
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/compute/kernel.h"
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/result.h"
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/type.h"
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/util/checked_cast.h"
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/util/fixed_width_internal.h"
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/util/logging.h"
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/util/small_vector.h"
namespace arrow20::util {
using ::arrow20::internal::checked_cast;
bool IsFixedWidthLike(const ArraySpan& source, bool force_null_count,
bool exclude_bool_and_dictionary) {
return IsFixedWidthLike(
source, force_null_count, [exclude_bool_and_dictionary](const DataType& type) {
return !exclude_bool_and_dictionary ||
(type.id() != Type::DICTIONARY && type.id() != Type::BOOL);
});
}
static int64_t FixedWidthInBytesFallback(const FixedSizeListType& fixed_size_list_type) {
auto* fsl = &fixed_size_list_type;
int64_t list_size = fsl->list_size();
for (auto type = fsl->value_type().get();;) {
if (type->id() == Type::FIXED_SIZE_LIST) {
fsl = checked_cast<const FixedSizeListType*>(type);
list_size *= fsl->list_size();
type = fsl->value_type().get();
continue;
}
if (type->id() != Type::BOOL && is_fixed_width(type->id())) {
const int64_t flat_byte_width = list_size * type->byte_width();
DCHECK_GE(flat_byte_width, 0);
return flat_byte_width;
}
break;
}
return -1;
}
int64_t FixedWidthInBytes(const DataType& type) {
auto type_id = type.id();
if (is_fixed_width(type_id)) {
const int32_t num_bits = type.bit_width();
return (type_id == Type::BOOL) ? -1 : num_bits / 8;
}
if (type_id == Type::FIXED_SIZE_LIST) {
auto& fsl = ::arrow20::internal::checked_cast<const FixedSizeListType&>(type);
return FixedWidthInBytesFallback(fsl);
}
return -1;
}
static int64_t FixedWidthInBitsFallback(const FixedSizeListType& fixed_size_list_type) {
auto* fsl = &fixed_size_list_type;
int64_t list_size = fsl->list_size();
for (auto type = fsl->value_type().get();;) {
auto type_id = type->id();
if (type_id == Type::FIXED_SIZE_LIST) {
fsl = checked_cast<const FixedSizeListType*>(type);
list_size *= fsl->list_size();
type = fsl->value_type().get();
continue;
}
if (is_fixed_width(type_id)) {
const int64_t flat_bit_width = list_size * type->bit_width();
DCHECK_GE(flat_bit_width, 0);
return flat_bit_width;
}
break;
}
return -1;
}
int64_t FixedWidthInBits(const DataType& type) {
auto type_id = type.id();
if (is_fixed_width(type_id)) {
return type.bit_width();
}
if (type_id == Type::FIXED_SIZE_LIST) {
auto& fsl = ::arrow20::internal::checked_cast<const FixedSizeListType&>(type);
return FixedWidthInBitsFallback(fsl);
}
return -1;
}
namespace internal {
Status PreallocateFixedWidthArrayData(::arrow20::compute::KernelContext* ctx,
int64_t length, const ArraySpan& source,
bool allocate_validity, ArrayData* out) {
DCHECK(!source.MayHaveNulls() || allocate_validity)
<< "allocate_validity cannot be false if source may have nulls";
DCHECK_EQ(source.type->id(), out->type->id());
auto* type = source.type;
out->length = length;
if (type->id() == Type::FIXED_SIZE_LIST) {
out->buffers.resize(1);
out->child_data = {std::make_shared<ArrayData>()};
} else {
out->buffers.resize(2);
}
if (allocate_validity) {
ARROW_ASSIGN_OR_RAISE(out->buffers[0], ctx->AllocateBitmap(length));
}
if (type->id() == Type::BOOL) {
ARROW_ASSIGN_OR_RAISE(out->buffers[1], ctx->AllocateBitmap(length));
return Status::OK();
}
if (is_fixed_width(type->id())) {
if (type->id() == Type::DICTIONARY) {
return Status::NotImplemented(
"PreallocateFixedWidthArrayData: DICTIONARY type allocation: ", *type);
}
ARROW_ASSIGN_OR_RAISE(out->buffers[1],
ctx->Allocate(length * source.type->byte_width()));
return Status::OK();
}
if (type->id() == Type::FIXED_SIZE_LIST) {
auto& fsl_type = checked_cast<const FixedSizeListType&>(*type);
auto& value_type = fsl_type.value_type();
if (ARROW_PREDICT_FALSE(value_type->id() == Type::DICTIONARY)) {
return Status::NotImplemented(
"PreallocateFixedWidthArrayData: DICTIONARY type allocation: ", *type);
}
if (source.child_data[0].MayHaveNulls()) {
return Status::Invalid(
"PreallocateFixedWidthArrayData: "
"FixedSizeList may have null values in child array: ",
fsl_type);
}
auto* child_values = out->child_data[0].get();
child_values->type = value_type;
return PreallocateFixedWidthArrayData(ctx, length * fsl_type.list_size(),
/*source=*/source.child_data[0],
/*allocate_validity=*/false,
/*out=*/child_values);
}
return Status::Invalid("PreallocateFixedWidthArrayData: Invalid type: ", *type);
}
} // namespace internal
std::pair<int, const uint8_t*> OffsetPointerOfFixedBitWidthValues(
const ArraySpan& source) {
using OffsetAndListSize = std::pair<int64_t, int64_t>;
auto get_offset = [](auto pair) { return pair.first; };
auto get_list_size = [](auto pair) { return pair.second; };
::arrow20::internal::SmallVector<OffsetAndListSize, 1> stack;
int64_t list_size = 1;
auto* array = &source;
while (array->type->id() == Type::FIXED_SIZE_LIST) {
list_size *= checked_cast<const FixedSizeListType*>(array->type)->list_size();
stack.emplace_back(array->offset, list_size);
array = &array->child_data[0];
}
// Now that innermost values were reached, pop the stack and calculate the offset
// in bytes of the innermost values buffer by considering the offset at each
// level of nesting.
DCHECK(is_fixed_width(*array->type));
DCHECK(array == &source || !array->MayHaveNulls())
<< "OffsetPointerOfFixedWidthValues: array is expected to be flat or have no "
"nulls in the arrays nested by FIXED_SIZE_LIST.";
int64_t value_width_in_bits = array->type->bit_width();
int64_t offset_in_bits = array->offset * value_width_in_bits;
for (auto it = stack.rbegin(); it != stack.rend(); ++it) {
value_width_in_bits *= get_list_size(*it);
offset_in_bits += get_offset(*it) * value_width_in_bits;
}
DCHECK_GE(value_width_in_bits, 0);
const auto* values_ptr = array->GetValues<uint8_t>(1, 0);
return {static_cast<int>(offset_in_bits % 8), values_ptr + (offset_in_bits / 8)};
}
const uint8_t* OffsetPointerOfFixedByteWidthValues(const ArraySpan& source) {
DCHECK(IsFixedWidthLike(source, /*force_null_count=*/false,
[](const DataType& type) { return type.id() != Type::BOOL; }));
return OffsetPointerOfFixedBitWidthValues(source).second;
}
/// \brief Get the mutable pointer to the fixed-width values of an array
/// allocated by PreallocateFixedWidthArrayData.
///
/// \pre mutable_array->offset and the offset of child array (if it's a
/// FixedSizeList) MUST be 0 (recursively).
/// \pre IsFixedWidthLike(ArraySpan(mutable_array)) or the more restrictive
/// is_fixed_width(*mutable_array->type) MUST be true
/// \return The mutable pointer to the fixed-width byte blocks of the array. If
/// pre-conditions are not satisfied, the return values is undefined.
uint8_t* MutableFixedWidthValuesPointer(ArrayData* mutable_array) {
auto* array = mutable_array;
auto type_id = array->type->id();
while (type_id == Type::FIXED_SIZE_LIST) {
DCHECK_EQ(array->offset, 0);
DCHECK_EQ(array->child_data.size(), 1) << array->type->ToString(true) << " part of "
<< mutable_array->type->ToString(true);
array = array->child_data[0].get();
type_id = array->type->id();
}
DCHECK_EQ(mutable_array->offset, 0);
// BOOL is allowed here only because the offset is expected to be 0,
// so the byte-aligned pointer also points to the first *bit* of the buffer.
DCHECK(is_fixed_width(type_id));
return array->GetMutableValues<uint8_t>(1, 0);
}
} // namespace arrow20::util
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