A. Coady created ARROW-13522:
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Summary: Regression with compute `utf8_*trim` functions.
Key: ARROW-13522
URL: https://issues.apache.org/jira/browse/ARROW-13522
Project: Apache Arrow
Issue Type: Bug
Components: C++, Python
Affects Versions: 5.0.0
Reporter: A. Coady
```python
import pyarrow as pa
import pyarrow.compute as pc
arr = pa.array(["ab", "ac"])
assert pc.utf8_ltrim(arr, characters="a").to_pylist() == ["b", ""]
assert pc.utf8_rtrim(arr, characters="b").to_pylist() == ["a", "a"]
```
Seems to go awry after the first match.
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