chelsea-lin opened a new issue, #45262: URL: https://github.com/apache/arrow/issues/45262
### Describe the bug, including details regarding any error messages, version, and platform. ### Description I'm trying to create a list array where each element is an array of a custom extension type, but I'm getting an `ArrowNotImplementedError: extension`. ### Reproduction steps Taken `RelationType` created in the pyarrow office doc as example ([link](https://arrow.apache.org/docs/python/extending_types.html#defining-extension-types-user-defined-types)), ```python import pyarrow as pa class RationalType(pa.ExtensionType): # ... (Your RationalType code) ... rational_type = RationalType(pa.int32()) data1 = [{"numer": 1, "denom": 17}, {"numer": 2, "denom": 13}] data2 = [{"numer": 3, "denom": 34}, {"numer": 4, "denom": 60}] pa.array(data1, type=rational_type) # Works fine pa.array([data1, data2], type=pa.list_(rational_type)) # Raises ArrowNotImplementedError ``` ### Actual behavior: The code raises the following error: ``` --------------------------------------------------------------------------- ArrowNotImplementedError Traceback (most recent call last) Cell In[33], [line 1](vscode-notebook-cell:?execution_count=33&line=1) ----> [1](vscode-notebook-cell:?execution_count=33&line=1) pa.array([data1, data2], type=pa.list_(rational_type)) File ~/src/python-db-dtypes-pandas/venv/lib/python3.12/site-packages/pyarrow/array.pxi:370, in pyarrow.lib.array() File ~/src/python-db-dtypes-pandas/venv/lib/python3.12/site-packages/pyarrow/array.pxi:42, in pyarrow.lib._sequence_to_array() File ~/src/python-db-dtypes-pandas/venv/lib/python3.12/site-packages/pyarrow/error.pxi:155, in pyarrow.lib.pyarrow_internal_check_status() File ~/src/python-db-dtypes-pandas/venv/lib/python3.12/site-packages/pyarrow/error.pxi:92, in pyarrow.lib.check_status() ArrowNotImplementedError: extension ``` ### Environment - pyarrow version: 18.1.0 - Python version: 3.12.7 ### Component(s) Python -- 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: issues-unsubscr...@arrow.apache.org.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
