cocoa-xu opened a new issue, #482:
URL: https://github.com/apache/arrow-nanoarrow/issues/482
Hi, I was wondering what's the proper/most recommended way to construct a
list? Let's say I'd like to construct a list of int32 (i.e., each row is a list
of int32), something like
| Row ID | data |
|--------|------|
| 0 | [1,2,3] |
| 1 | [4,5,6] |
Here is what I'm doing for now:
```cpp
// create first row of int32, [1,2,3]
struct ArrowSchema int32_schema{};
struct ArrowArray int32_values{};
struct ArrowError arrow_error{};
ArrowSchemaInit(int32_schema);
NANOARROW_RETURN_NOT_OK(ArrowSchemaSetType(int32_schema,
NANOARROW_TYPE_INT32));
NANOARROW_RETURN_NOT_OK(ArrowArrayInitFromSchema(int32_values, int32_schema,
arrow_error));
NANOARROW_RETURN_NOT_OK(ArrowArrayStartAppending(int32_values));
NANOARROW_RETURN_NOT_OK(ArrowArrayAppendInt(int32_values, 1));
NANOARROW_RETURN_NOT_OK(ArrowArrayAppendInt(int32_values, 2));
NANOARROW_RETURN_NOT_OK(ArrowArrayAppendInt(int32_values, 3));
NANOARROW_RETURN_NOT_OK(ArrowArrayFinishBuildingDefault(int32_values,
arrow_error));
// create list of int32
struct ArrowSchema schema{};
struct ArrowArray values{};
ArrowSchemaInit(schema);
NANOARROW_RETURN_NOT_OK(ArrowSchemaSetType(schema, NANOARROW_TYPE_LIST));
NANOARROW_RETURN_NOT_OK(ArrowArrayInitFromType(values, NANOARROW_TYPE_LIST));
```
And now I'm not sure how I can properly append a list of int32 (i.e.,
`int32_values`) to `values`. Should I use low-level functions like
- ArrowArrayAllocateChildren
- ArrowArraySetValidityBitmap
- ArrowArraySetBuffer
to construct the list (`values`) myself, or am I missing something in my
code? Any suggestions/examples would be highly appreciated. :)
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