AlvinJ15 commented on code in PR #13009:
URL: https://github.com/apache/arrow/pull/13009#discussion_r870017986
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cpp/src/arrow/stl_iterator.h:
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@@ -128,6 +131,162 @@ class ArrayIterator {
int64_t index_;
};
+template <typename ArrayType,
+ typename ValueAccessor = detail::DefaultValueAccessor<ArrayType>>
+class ChunkedArrayIterator {
+ public:
+ using value_type = arrow::util::optional<typename ValueAccessor::ValueType>;
+ using difference_type = int64_t;
+ using pointer = value_type*;
+ using reference = value_type&;
+ using iterator_category = std::random_access_iterator_tag;
+
+ // Some algorithms need to default-construct an iterator
+ ChunkedArrayIterator() : chunked_array_(NULLPTR), index_(0) {}
+
+ explicit ChunkedArrayIterator(const ChunkedArray& chunked_array, int64_t
index = 0)
+ : chunked_array_(&chunked_array), index_(index) {
+ if (index_ != chunked_array.length()) {
+ auto chunk_location = GetChunkLocation(this->index_);
+ current_array_iterator_ = ArrayIterator<ArrayType>(
+ arrow::internal::checked_cast<const ArrayType&>(
+
*chunked_array_->chunk(static_cast<int>(chunk_location.chunk_index))),
+ chunk_location.index_in_chunk);
+ } else {
+ current_array_iterator_ = {};
+ }
+ }
+
+ // Value access
+ value_type operator*() const { return *current_array_iterator_; }
+
+ value_type operator[](difference_type n) const {
Review Comment:
I added some `assert` for check it.
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