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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 "contrib/libs/apache/arrow_next/cpp/src/arrow/chunk_resolver.h"
#include <algorithm>
#include <cstdint>
#include <limits>
#include <memory>
#include <vector>
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/array.h"
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/record_batch.h"
namespace arrow20 {
using util::span;
namespace {
template <typename T>
int64_t GetLength(const T& array) {
// General case assumes argument is an Array pointer
return array->length();
}
template <>
int64_t GetLength<std::shared_ptr<RecordBatch>>(
const std::shared_ptr<RecordBatch>& batch) {
return batch->num_rows();
}
template <typename T>
inline std::vector<int64_t> MakeChunksOffsets(span<T> chunks) {
std::vector<int64_t> offsets(chunks.size() + 1);
int64_t offset = 0;
std::transform(chunks.begin(), chunks.end(), offsets.begin(),
[&offset](const T& chunk) {
auto curr_offset = offset;
offset += GetLength(chunk);
return curr_offset;
});
offsets[chunks.size()] = offset;
return offsets;
}
template <typename IndexType>
inline TypedChunkLocation<IndexType> ResolveOneInline(uint32_t num_offsets,
const uint64_t* offsets,
IndexType typed_logical_index,
int32_t num_chunks,
int32_t chunk_hint) {
const auto index = static_cast<uint64_t>(typed_logical_index);
// use or update chunk_hint
if (index >= offsets[chunk_hint] &&
(chunk_hint == num_chunks || index < offsets[chunk_hint + 1])) {
// hint is correct!
} else {
// lo < hi is guaranteed by `num_offsets = chunks.size() + 1`
auto chunk_index =
ChunkResolver::Bisect(index, offsets, /*lo=*/0, /*hi=*/num_offsets);
chunk_hint = static_cast<int32_t>(chunk_index);
}
// chunk_index is in [0, chunks.size()] no matter what the value
// of logical_index is, so it's always safe to dereference offsets
// as it contains chunks.size()+1 values.
auto loc = TypedChunkLocation<IndexType>(
/*chunk_index=*/chunk_hint,
/*index_in_chunk=*/typed_logical_index -
static_cast<IndexType>(offsets[chunk_hint]));
#if defined(ARROW_VALGRIND) || defined(ADDRESS_SANITIZER)
// Make it more likely that Valgrind/ASAN can catch an invalid memory
// access by poisoning the index-in-chunk value when the logical
// index is out-of-bounds.
if (static_cast<int32_t>(loc.chunk_index) == num_chunks) {
loc.index_in_chunk = std::numeric_limits<IndexType>::max();
}
#endif
return loc;
}
/// \pre all the pre-conditions of ChunkResolver::ResolveMany()
/// \pre num_offsets - 1 <= std::numeric_limits<IndexType>::max()
template <typename IndexType>
void ResolveManyInline(uint32_t num_offsets, const int64_t* signed_offsets,
int64_t n_indices, const IndexType* logical_index_vec,
TypedChunkLocation<IndexType>* out_chunk_location_vec,
int32_t chunk_hint) {
auto* offsets = reinterpret_cast<const uint64_t*>(signed_offsets);
const auto num_chunks = static_cast<int32_t>(num_offsets - 1);
// chunk_hint in [0, num_offsets) per the precondition.
for (int64_t i = 0; i < n_indices; i++) {
const auto typed_logical_index = logical_index_vec[i];
const auto loc = ResolveOneInline(num_offsets, offsets, typed_logical_index,
num_chunks, chunk_hint);
out_chunk_location_vec[i] = loc;
chunk_hint = static_cast<int32_t>(loc.chunk_index);
}
}
} // namespace
ChunkResolver::ChunkResolver(const ArrayVector& chunks) noexcept
: offsets_(MakeChunksOffsets(span(chunks))), cached_chunk_(0) {}
ChunkResolver::ChunkResolver(span<const Array* const> chunks) noexcept
: offsets_(MakeChunksOffsets(chunks)), cached_chunk_(0) {}
ChunkResolver::ChunkResolver(const RecordBatchVector& batches) noexcept
: offsets_(MakeChunksOffsets(span(batches))), cached_chunk_(0) {}
ChunkResolver::ChunkResolver(ChunkResolver&& other) noexcept
: offsets_(std::move(other.offsets_)),
cached_chunk_(other.cached_chunk_.load(std::memory_order_relaxed)) {}
ChunkResolver& ChunkResolver::operator=(ChunkResolver&& other) noexcept {
offsets_ = std::move(other.offsets_);
cached_chunk_.store(other.cached_chunk_.load(std::memory_order_relaxed));
return *this;
}
ChunkResolver::ChunkResolver(const ChunkResolver& other) noexcept
: offsets_(other.offsets_), cached_chunk_(0) {}
ChunkResolver& ChunkResolver::operator=(const ChunkResolver& other) noexcept {
offsets_ = other.offsets_;
cached_chunk_.store(0, std::memory_order_relaxed);
return *this;
}
void ChunkResolver::ResolveManyImpl(int64_t n_indices, const uint8_t* logical_index_vec,
TypedChunkLocation<uint8_t>* out_chunk_location_vec,
int32_t chunk_hint) const {
ResolveManyInline(static_cast<uint32_t>(offsets_.size()), offsets_.data(), n_indices,
logical_index_vec, out_chunk_location_vec, chunk_hint);
}
void ChunkResolver::ResolveManyImpl(int64_t n_indices, const uint16_t* logical_index_vec,
TypedChunkLocation<uint16_t>* out_chunk_location_vec,
int32_t chunk_hint) const {
ResolveManyInline(static_cast<uint32_t>(offsets_.size()), offsets_.data(), n_indices,
logical_index_vec, out_chunk_location_vec, chunk_hint);
}
void ChunkResolver::ResolveManyImpl(int64_t n_indices, const uint32_t* logical_index_vec,
TypedChunkLocation<uint32_t>* out_chunk_location_vec,
int32_t chunk_hint) const {
ResolveManyInline(static_cast<uint32_t>(offsets_.size()), offsets_.data(), n_indices,
logical_index_vec, out_chunk_location_vec, chunk_hint);
}
void ChunkResolver::ResolveManyImpl(int64_t n_indices, const uint64_t* logical_index_vec,
TypedChunkLocation<uint64_t>* out_chunk_location_vec,
int32_t chunk_hint) const {
ResolveManyInline(static_cast<uint32_t>(offsets_.size()), offsets_.data(), n_indices,
logical_index_vec, out_chunk_location_vec, chunk_hint);
}
} // namespace arrow20
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