alippai opened a new issue, #47382: URL: https://github.com/apache/arrow/issues/47382
### Describe the enhancement requested Converting an ndarray to the table structure often can be achieved using `np.tile()` and `np.repeat()` on the ndarray labels. If the data type in numpy is not zero copy to pyarrow, casting the expanded columns to pyarrow is expensive. It'd be more efficient to cast first, then use `pa.array().repeat()` and `pa.array().tile()`. Practically the low level building blocks of `pa.Table.from_xarray(xr.Dataset)`. ### Component(s) Python, C++ -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
