pub fn merge_column_index<'a>(
columns: &'a [ColumnIndex],
merge_row_order: &'a MergeRowOrder,
) -> SerializableColumnIndex<'a>
pub fn merge_column_index<'a>(
columns: &'a [ColumnIndex],
merge_row_order: &'a MergeRowOrder,
) -> SerializableColumnIndex<'a>