[GitHub] [arrow-nanoarrow] paleolimbot opened a new issue, #5: Implement `ArrowArray*` helpers

[GitBox <gi...@apache.org>]

paleolimbot opened a new issue, #5:
URL: https://github.com/apache/arrow-nanoarrow/issues/5

   Now that we have buffer holders (`struct ArrowBuffer`) we can implement an owning `struct ArrowArray`. I envision the API something like the `ArrowSchema*` helpers:
   
   - `ArrowArrayInit(struct ArrowArray* array, int64_t n_buffers)`
   - `ArrowArrayAllocateChildren(struct ArrowArray* array, int64_t n_children)`
   - `ArrowArraySetBuffer(struct ArrowArray* array, int64_t i, struct ArrowBuffer* buffer)` (moves the `struct ArrowBuffer` so that it lives in memory owned by `array->private_data` and sets `array->buffers[i] = buffer->data`).
   
   @lidavidm commented:
   
   Maybe `Init` could take the type and then it would know how many buffers to allocate? (Ditto for `AllocateChildren`)
   
   @paleolimbot commented:
   
   Ah that makes sense, and parallels `ArrowSchemaInit()` (where the caller can fall back on `NANOARROW_TYPE_UNINITIALIZED` if they're implementing their own logic). I think `ArrowArrayAllocateChildren()` has to exist on its own, but the utility of a helper like `ArrowArrayInitFromSchemaView(struct ArrowArray* array, struct ArrowSchemaView* view, struct ArrowError* error)` might become clear at some point (since the schema view contains all the information needed to initialize all the buffers for all the recursive children).


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[GitHub] [arrow-nanoarrow] paleolimbot closed issue #5: Implement `ArrowArray*` helpers

[GitBox <gi...@apache.org>]

paleolimbot closed issue #5: Implement `ArrowArray*` helpers
URL: https://github.com/apache/arrow-nanoarrow/issues/5


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