erratic-pattern opened a new issue, #11258:
URL: https://github.com/apache/datafusion/issues/11258
### Describe the bug
Type coercion doesn't seem to handle NULL in a `CASE` branch when used
inside of an aggregate.
### To Reproduce
In Datafusion CLI:
```
> CREATE TABLE example(data double precision);
0 row(s) fetched.
Elapsed 0.005 seconds.
> SELECT sum(CASE WHEN data is NULL THEN NULL ELSE data + 1 END) FROM
example;
Error during planning: Execution error: User-defined coercion failed with
Execution("Sum not supported for Null") No function matches the given name and
argument types 'sum(Null)'. You might need to add explicit type casts.
Candidate functions:
sum(UserDefined)
```
### Expected behavior
`NULL` type should coerce to the `ELSE` branch type.
### Additional context
_No response_
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