Incorrect null literal handling for to_local_time() function (SQLancer) #17472
Description
Describe the bug
datafusion-cli is compiled from the latest main commit d19bf52
> select to_local_time(null);
Error during planning: Execution error: Function 'to_local_time' user-defined coercion failed with "Error during planning: The to_local_time function can only accept Timestamp as the arg got Null" No function matches the given name and argument types 'to_local_time(Null)'. You might need to add explicit type casts.
Candidate functions:
to_local_time(UserDefined)
null literal can be interpreted as a missing value of Timestamp type, I think it would be more reasonable to return NULL instead of planning error.
To Reproduce
No response
Expected behavior
No response
Additional context
Found by SQLancer #11030