flarion-weijun opened a new issue, #18530:
URL: https://github.com/apache/datafusion/issues/18530
### Describe the bug
When reading a table that contains `NULL` map values (where the entire map
is `NULL`, not individual keys within a map), DataFusion's `make_map` function
incorrectly fails with the error "map key cannot be null". This affects queries
that process map columns containing NULL values, particularly when using UDFs
or operations that reconstruct maps.
### To Reproduce
Create a table with a Map column containing NULL values:
```sql
CREATE TABLE test_null_map AS VALUES
('1', MAP {'a': 'ab'}),
('2', NULL),
('3', MAP {'b': 'cd'});
SELECT map_keys(column2) FROM test_null_map;
```
### Expected behavior
_No response_
### Additional context
_No response_
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