test sort_on_window_null_string failed after disable skip_fail.

[jackwener]

Describe the bug
after disable skip_fail

test: sort_on_window_null_string failed

called Result::unwrap() on an Err value: Context("type_coercion", Internal("Optimizer rule 'type_coercion' failed due to unexpected error: Internal error: Cannot run range queries on datatype: Utf8. This was likely caused by a bug in DataFusion's code and we would welcome that you file an bug report in our issue tracker"))

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Expected behavior
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Additional context
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