Fokko opened a new issue, #36845:
URL: https://github.com/apache/arrow/issues/36845
### Describe the enhancement requested
I would expect to allow `concat_tables` to promote an int32 to an int64:
```python
def test_concat_tables_with_promotion_int():
import pyarrow as pa
t1 = pa.Table.from_arrays(
[pa.array([1, 2], type=pa.int64())], ["int"])
t2 = pa.Table.from_arrays(
[pa.array([3, 4], type=pa.int32())], ["int"])
result = pa.concat_tables([t1, t2], promote=True)
assert result.equals(pa.Table.from_arrays([
pa.array([1, 2, 3, 4], type=pa.int64())
], ["int"]))
```
This fails with PyArrow 12.0.0.1
```
> ???
E pyarrow.lib.ArrowInvalid: Unable to merge: Field int has incompatible
types: int64 vs int32
```
### Component(s)
Python
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