felipecrv commented on code in PR #41956:
URL: https://github.com/apache/arrow/pull/41956#discussion_r1637317325
##########
cpp/src/arrow/array/array_nested.cc:
##########
@@ -847,30 +847,32 @@ Result<std::shared_ptr<Array>>
MapArray::FromArraysInternal(
const auto& typed_offsets = checked_cast<const OffsetArrayType&>(*offsets);
BufferVector buffers;
- int64_t null_count;
- if (null_bitmap != nullptr) {
- buffers = BufferVector({std::move(null_bitmap), typed_offsets.values()});
- null_count = null_bitmap->size();
- } else {
- buffers = BufferVector({null_bitmap, typed_offsets.values()});
- null_count = 0;
+ buffers.resize(2);
+ int64_t null_count = 0;
+ if (null_bitmap) {
+ buffers[0] = std::move(null_bitmap);
+ null_count = kUnknownNullCount;
}
+ buffers[1] = typed_offsets.values();
return std::make_shared<MapArray>(type, offsets->length() - 1,
std::move(buffers), keys,
items, /*null_count=*/null_count,
offsets->offset());
}
-Result<std::shared_ptr<Array>> MapArray::FromArrays(
- const std::shared_ptr<Array>& offsets, const std::shared_ptr<Array>& keys,
- const std::shared_ptr<Array>& items, MemoryPool* pool,
- const std::shared_ptr<Buffer>& null_bitmap) {
+Result<std::shared_ptr<Array>> MapArray::FromArrays(const
std::shared_ptr<Array>& offsets,
+ const
std::shared_ptr<Array>& keys,
+ const
std::shared_ptr<Array>& items,
+ MemoryPool* pool,
+ std::shared_ptr<Buffer>
null_bitmap) {
return FromArraysInternal(std::make_shared<MapType>(keys->type(),
items->type()),
offsets, keys, items, pool, null_bitmap);
}
-Result<std::shared_ptr<Array>> MapArray::FromArrays(
- std::shared_ptr<DataType> type, const std::shared_ptr<Array>& offsets,
- const std::shared_ptr<Array>& keys, const std::shared_ptr<Array>& items,
- MemoryPool* pool, const std::shared_ptr<Buffer>& null_bitmap) {
+Result<std::shared_ptr<Array>> MapArray::FromArrays(std::shared_ptr<DataType>
type,
+ const
std::shared_ptr<Array>& offsets,
+ const
std::shared_ptr<Array>& keys,
+ const
std::shared_ptr<Array>& items,
+ MemoryPool* pool,
+ std::shared_ptr<Buffer>
null_bitmap) {
Review Comment:
Fun fact: Rust does "move" by default.
`a = b;` is like `a = std::move(b);` in C++ and the compiler will complain
at you if you use `b` after `a = b;`.
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