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#pragma clang system_header
// 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.
#pragma once
#include <algorithm>
#include <cstdint>
#include <memory>
#include <utility>
#include <vector>
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/array.h"
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/chunk_resolver.h"
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/compute/kernels/codegen_internal.h"
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/util/span.h"
namespace arrow20::compute::internal {
// The target chunk in a chunked array.
struct ResolvedChunk {
// The target array in chunked array.
const Array* array;
// The index in the target array.
int64_t index;
ResolvedChunk(const Array* array, int64_t index) : array(array), index(index) {}
friend bool operator==(const ResolvedChunk& left, const ResolvedChunk& right) {
return left.array == right.array && left.index == right.index;
}
friend bool operator!=(const ResolvedChunk& left, const ResolvedChunk& right) {
return left.array != right.array || left.index != right.index;
}
bool IsNull() const { return array->IsNull(index); }
template <typename ArrowType, typename ViewType = GetViewType<ArrowType>>
typename ViewType::T Value() const {
using LogicalArrayType = typename TypeTraits<ArrowType>::ArrayType;
auto* typed_array = checked_cast<const LogicalArrayType*>(array);
return ViewType::LogicalValue(typed_array->GetView(index));
}
};
// A compressed (chunk_index, index_in_chunk) pair.
// The goal of compression is to make it fit in 64 bits, allowing in place
// replacement of logical uint64_t indices with physical indices.
// (see ChunkedIndexMapper)
struct CompressedChunkLocation {
static constexpr int kChunkIndexBits = 24;
static constexpr int KIndexInChunkBits = 64 - kChunkIndexBits;
static constexpr uint64_t kMaxChunkIndex = (1ULL << kChunkIndexBits) - 1;
static constexpr uint64_t kMaxIndexInChunk = (1ULL << KIndexInChunkBits) - 1;
CompressedChunkLocation() = default;
constexpr uint64_t chunk_index() const { return data_ & kMaxChunkIndex; }
constexpr uint64_t index_in_chunk() const { return data_ >> kChunkIndexBits; }
explicit constexpr CompressedChunkLocation(uint64_t chunk_index,
uint64_t index_in_chunk)
: data_((index_in_chunk << kChunkIndexBits) | chunk_index) {}
template <typename IndexType>
explicit operator TypedChunkLocation<IndexType>() {
return {static_cast<IndexType>(chunk_index()),
static_cast<IndexType>(index_in_chunk())};
}
private:
uint64_t data_;
};
static_assert(sizeof(uint64_t) == sizeof(CompressedChunkLocation));
class ChunkedArrayResolver {
private:
ChunkResolver resolver_;
util::span<const Array* const> chunks_;
std::vector<const Array*> owned_chunks_;
public:
explicit ChunkedArrayResolver(std::vector<const Array*>&& chunks)
: resolver_(chunks), chunks_(chunks), owned_chunks_(std::move(chunks)) {}
explicit ChunkedArrayResolver(util::span<const Array* const> chunks)
: resolver_(chunks), chunks_(chunks) {}
ARROW_DEFAULT_MOVE_AND_ASSIGN(ChunkedArrayResolver);
ChunkedArrayResolver(const ChunkedArrayResolver& other)
: resolver_(other.resolver_), owned_chunks_(other.owned_chunks_) {
// Rebind span to owned_chunks_ if necessary
chunks_ = owned_chunks_.empty() ? other.chunks_ : owned_chunks_;
}
ChunkedArrayResolver& operator=(const ChunkedArrayResolver& other) {
resolver_ = other.resolver_;
owned_chunks_ = other.owned_chunks_;
chunks_ = owned_chunks_.empty() ? other.chunks_ : owned_chunks_;
return *this;
}
ResolvedChunk Resolve(int64_t index) const {
const auto loc = resolver_.Resolve(index);
return {chunks_[loc.chunk_index], loc.index_in_chunk};
}
};
std::vector<const Array*> GetArrayPointers(const ArrayVector& arrays);
// A class that turns logical (linear) indices into physical (chunked) indices,
// and vice-versa.
class ChunkedIndexMapper {
public:
ChunkedIndexMapper(const std::vector<const Array*>& chunks, uint64_t* indices_begin,
uint64_t* indices_end)
: ChunkedIndexMapper(util::span(chunks), indices_begin, indices_end) {}
ChunkedIndexMapper(util::span<const Array* const> chunks, uint64_t* indices_begin,
uint64_t* indices_end)
: chunk_lengths_(GetChunkLengths(chunks)),
indices_begin_(indices_begin),
indices_end_(indices_end) {}
ChunkedIndexMapper(const RecordBatchVector& chunks, uint64_t* indices_begin,
uint64_t* indices_end)
: chunk_lengths_(GetChunkLengths(chunks)),
indices_begin_(indices_begin),
indices_end_(indices_end) {}
// Turn the original uint64_t logical indices into physical. This reuses the
// same memory area, so the logical indices cannot be used anymore until
// PhysicalToLogical() is called.
//
// This assumes that the logical indices are originally chunk-partitioned.
Result<std::pair<CompressedChunkLocation*, CompressedChunkLocation*>>
LogicalToPhysical();
// Turn the physical indices back into logical, making the uint64_t indices
// usable again.
Status PhysicalToLogical();
private:
static std::vector<int64_t> GetChunkLengths(util::span<const Array* const> chunks);
static std::vector<int64_t> GetChunkLengths(const RecordBatchVector& chunks);
std::vector<int64_t> chunk_lengths_;
uint64_t* indices_begin_;
uint64_t* indices_end_;
};
} // namespace arrow20::compute::internal
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