[I] Memory pointer from external source (e.g, FFI) is not aligned for empty list[str] [arrow-rs]

["ion-elgreco (via GitHub)" <gi...@apache.org>]

ion-elgreco opened a new issue, #7549:
URL: https://github.com/apache/arrow-rs/issues/7549

   **Describe the bug**
   Can't consume arrow data with empty list[str] over FFI
   
   
   **To Reproduce**
   ```python
   import polars as pl
   from arro3.core import Table
   df = pl.DataFrame(
       {
           "bar": [[]],
       }, schema={"bar": pl.List(pl.String)}
   )
   
   Table(df)
   ```
   
   **Expected behavior**
   Pyarrow seems to be able to consume this empty list[str] fine,
   
   ```python
   import polars as pl
   import pyarrow as pa
   df = pl.DataFrame(
       {
           "bar": [[]],
       }, schema={"bar": pl.List(pl.String)}
   )
   
   pa.table(df)
   ```
   
   **Additional context**
   Created also issue in polars repo: https://github.com/pola-rs/polars/issues/22935, since it's not clear to me where the issue lies, wether it's polars buffers being misaligned or arrow-rs incorrectly identifying it because pyarrow seems to be able to consume it fine.


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Re: [I] Memory pointer from external source (e.g, FFI) is not aligned for empty list[str] [arrow-rs]

["alamb (via GitHub)" <gi...@apache.org>]

alamb closed issue #7549: Memory pointer from external source (e.g, FFI) is not aligned for empty list[str]
URL: https://github.com/apache/arrow-rs/issues/7549


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Re: [I] Memory pointer from external source (e.g, FFI) is not aligned for empty list[str] [arrow-rs]

["viirya (via GitHub)" <gi...@apache.org>]

viirya commented on issue #7549:
URL: https://github.com/apache/arrow-rs/issues/7549#issuecomment-3126115149

   I reproduced the reported issue locally with a arro3 test case to arro3 repo.
   
   Proposed #8009 as a fix. I verified that after applying the patch, the Python test case can run without issue.


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