We allow arrays to have a shorter length than their buffers. Is it also
legal for a struct array to have a shorter length than its child arrays?
For example, in C++, I can create this today by slicing a struct array:
```
std::shared_ptr my_array =
std::dynamic_pointer_cast(array);
ASSERT_EQ(m
IMHO, this is valid. As you have demonstrated in the example, a sliced
struct array will result in a length shorter than its child arrays. This
kind
of flexibility can make it easy to reuse child arrays within the struct
array.
> Struct: a nested layout consisting of a collection of named child fi
I agree with Gang. The fact that a struct field may be backed by a
physically larger C++ ArrayData is irrelevant, as long as it's logically
interpreted as having "the same length".
(however, this implementation detail should ideally not leak into IPC or
C Data exports)
Regards
Antoine.
>
> I think the `the same length` means the length of the struct array, this is
> similar in the case of RecordBatch where the `num_rows` of a RecordBatch
> can be different to the length of its fields.
I didn't think this is true and I thought we had prior discussions on the
mailing list sugges
