Robbie Gruener created ARROW-16611:
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Summary: MapArray pandas round trip is broken
Key: ARROW-16611
URL: https://issues.apache.org/jira/browse/ARROW-16611
Project: Apache Arrow
Issue Type: Bug
Affects Versions: 8.0.0
Reporter: Robbie Gruener
pyarrow.MapArray when converted to pandas cannot be successfully converted back.
The following snipper does not work:
```
import pyarrow as pa
data = [[('x', 1), ('y', 0)], [('a', 2), ('b', 45)]]
ty = pa.map_(pa.string(), pa.int64())
map_col = pa.array(data, type=ty)
pa.MapArray.from_pandas(map_col.to_pandas())
```
`Uncaught exception: ArrowTypeError: Expected bytes, got a 'int' object
(java.lang.RuntimeException)`
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