Sorting on a logical date column should be consistent across visualization types.
Currently a logical column (e.g. CAST ('01-' || MMM-YYYY) AS DATE)) sorting within a table does correctly use the implicit sort order defined in the RPD, a chart type does not sort using the same implicit sort order.
Per O Support:
The SortKey function should only be used on simple column references. The SortKey function should not be used on more complex expressions like CASE WHEN or CAST().