jorisvandenbossche opened a new issue, #41283:
URL: https://github.com/apache/arrow/issues/41283
### Describe the bug, including details regarding any error messages,
version, and platform.
While this is invalid according to our spec, we should raise a proper
exception about it instead of crashing:
```
data = [
[{'key': 'key1', 'value': 10}],
[{'key': 'key2', 'value': 8}, None, {'key': 'key3', 'value': 5}]
]
pa.array(data, type=pa.map_(pa.string(), pa.int32()))
```
gives:
```
/home/joris/scipy/repos/arrow/cpp/src/arrow/array/array_nested.cc:848:
Check failed: _s.ok() Operation failed: ValidateChildData(data->child_data)
Bad status: Invalid: Map array child array should have no nulls
Aborted (core dumped)
```
(so we already have the correct status message, but this comes from the
MapArray constructor that just does
`ARROW_CHECK_OK(ValidateChildData(data->child_data));`, i.e. not bubbling it up
as a status / python error.
### Component(s)
Python
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