fn find_uncovered_output_fields(
projection_info: &OutputProjectionInfo,
group_key_names: &[String],
merge_columns: &[IncrementalAggregateMergeColumn],
) -> Vec<String>fn find_uncovered_output_fields(
projection_info: &OutputProjectionInfo,
group_key_names: &[String],
merge_columns: &[IncrementalAggregateMergeColumn],
) -> Vec<String>