fenfeng9 commented on PR #49908:
URL: https://github.com/apache/arrow/pull/49908#issuecomment-4379552496
The original behavior is:
#### Reproduce
```python
import pyarrow as pa
import pyarrow.compute as pc
array = pa.array([1, 1, None, None, None, 2, 2, 2, None, 3])
encoded = pc.run_end_encode(array)
# Logical slice: [None, None, 2, 2, 2, None].
slice_plain = array.slice(3, 6)
slice_encoded = encoded.slice(3, 6)
print("pyarrow:", pa.__version__)
print()
print(f"{'case':<12} {'only_valid':>10} {'only_null':>10} {'all':>6}")
for name, value in [
("plain", array),
("ree", encoded),
("slice plain", slice_plain),
("slice ree", slice_encoded),
]:
print(
f"{name:<12} "
f"{pc.count(value, mode='only_valid').as_py():>10} "
f"{pc.count(value, mode='only_null').as_py():>10} "
f"{pc.count(value, mode='all').as_py():>6}"
)
```
#### Result
```
pyarrow: 24.0.0
case only_valid only_null all
plain 6 4 10
ree 10 0 10
slice plain 3 3 6
slice ree 6 0 6
```
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