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69 lines (58 loc) · 2.19 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/chunk_resolver.h"
#include <algorithm>
#include <cstdint>
#include <memory>
#include <vector>
#include "arrow/array.h"
#include "arrow/record_batch.h"
namespace arrow {
namespace internal {
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(const std::vector<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;
}
} // namespace
ChunkResolver::ChunkResolver(const ArrayVector& chunks)
: offsets_(MakeChunksOffsets(chunks)), cached_chunk_(0) {}
ChunkResolver::ChunkResolver(const std::vector<const Array*>& chunks)
: offsets_(MakeChunksOffsets(chunks)), cached_chunk_(0) {}
ChunkResolver::ChunkResolver(const RecordBatchVector& batches)
: offsets_(MakeChunksOffsets(batches)), cached_chunk_(0) {}
} // namespace internal
} // namespace arrow