Fly-a-Kite opened a new issue, #50043:
URL: https://github.com/apache/arrow/issues/50043
### Describe the bug, including details regarding any error messages,
version, and platform.
## Environment
```text
pyarrow: 24.0.0
Python: 3.12.3
Platform: Ubuntu24.04
```
`24.0.0` was the latest PyPI release when reproduced on 2026-05-26.
## Reproducer
```python
import pyarrow as pa
import pyarrow.compute as pc
base = pa.table({"g": [99, 10, 10], "flag": [True, False, None]})
sliced = base.slice(1)
rebuilt = pa.table(sliced.to_pydict())
def grouped_any(table):
return (
table.group_by("g", use_threads=False)
.aggregate([("flag", "any")])
.column("flag_any")
.to_pylist()
)
print("offset:", sliced["flag"].chunk(0).offset)
print("scalar any:", pc.any(pa.array([False, None])).as_py())
print("sliced:", grouped_any(sliced))
print("rebuilt:", grouped_any(rebuilt))
```
## Actual Output
```text
offset: 1
scalar any: False
sliced: [True]
rebuilt: [False]
```
## Expected Output
```text
sliced: [False]
rebuilt: [False]
```
After `slice(1)`, the only rows in group `g=10` have `flag` values
`[False, None]`. The grouped `any` result should therefore agree with scalar
`compute.any` and the zero-offset rebuilt table.
### Component(s)
Python
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