robhod opened a new issue, #44383: URL: https://github.com/apache/arrow/issues/44383
### Describe the usage question you have. Please include as many useful details as possible. I'm trying to create a list of structs based on a grouping column. See below: Hitting not implemented error but hash_list docs (https://arrow.apache.org/docs/cpp/compute.html#aggregations) suggest it supports any input type so wasn't sure if there was an issue in how I set this up or if I should raise a feature request/bug? ```python import pyarrow as pa # source data table = pa.table( { "col1": [1, 1, 2, 2, 3], "struct_col": [ {"a": 1, "b": "testa"}, {"a": 1, "b": "testb"}, {"a": 2, "b": "testc"}, {"a": 2, "b": "testd"}, {"a": 3, "b": "teste"}, ], } ) # required output grouped_table = pa.table( { "grouped": [1, 2, 3], "agg_struct_col": [ [{"a": 1, "b": "testa"}, {"a": 1, "b": "testb"}], [{"a": 2, "b": "testc"}, {"a": 2, "b": "testd"}], [{"a": 3, "b": "teste"}], ], } ) # using group_by grouped = table.group_by("col1").aggregate([("struct_col", "list")]) ``` File "scratch/pyarrowexample.py", line 30, in <module> grouped = table.group_by("col1").aggregate([("struct_col", "hash_list")]) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "pyarrow/table.pxi", line 6359, in pyarrow.lib.TableGroupBy.aggregate File "l/.venv/lib/python3.11/site-packages/pyarrow/acero.py", line 403, in _group_by return decl.to_table(use_threads=use_threads) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "pyarrow/_acero.pyx", line 590, in pyarrow._acero.Declaration.to_table File "pyarrow/error.pxi", line 155, in pyarrow.lib.pyarrow_internal_check_status File "pyarrow/error.pxi", line 92, in pyarrow.lib.check_status pyarrow.lib.ArrowNotImplementedError: Function 'hash_list' has no kernel matching input types (struct<a: int64, b: string>, uint32) ### 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
