pitrou commented on issue #46814:
URL: https://github.com/apache/arrow/issues/46814#issuecomment-3345763763
Ok, it looks like all chunks of the group key column (`uri`) are actually
slices of a single physical String array. The problem is then the 32-bit
offsets of that String array become negative at some point, because the
underlying data is too large:
```python
>>> binary_offsets[34170796-5:34170796+5]
array([ 2147483331, 2147483401, 2147483471, 2147483541, 2147483611,
-2147483615, -2147483545, -2147483475, -2147483405, -2147483335],
dtype=int32)
```
@zanmato1984 Is this a well-known bug?
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