pitrou commented on issue #47252:
URL: https://github.com/apache/arrow/issues/47252#issuecomment-3266773591
I have a debug build of git main and I can't reproduce:
```python
>>> import pyarrow as pa
...: from datetime import datetime
...:
...: tables = [
...: pa.Table.from_pydict(
...: {
...: "date": [datetime(2020, 1, 1)],
...: "variable": ["aapl"],
...: "price": [110],
...: }
...: ),
...: pa.Table.from_pydict(
...: {
...: "date": [datetime(2020, 1, 1)],
...: "variable": ["tlsa"],
...: "price": [220],
...: }
...: ),
...: ]
>>> unpivoted = pa.concat_tables(tables)
>>> unpivoted
pyarrow.Table
date: timestamp[us]
variable: string
price: int64
----
date: [[2020-01-01 00:00:00.000000],[2020-01-01 00:00:00.000000]]
variable: [["aapl"],["tlsa"]]
price: [[110],[220]]
>>> unpivoted.sort_by([("date", "ascending"), ("variable", "ascending")])
pyarrow.Table
date: timestamp[us]
variable: string
price: int64
----
date: [[2020-01-01 00:00:00.000000,2020-01-01 00:00:00.000000]]
variable: [["aapl","tlsa"]]
price: [[110,220]]
```
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