Affects Version/s: None
Fix Version/s: None
Component/s: Table SQL / API
Implement functions for generating and consuming retract messages for different aggregates.
1. add delete/add property to Row
2. implement functions for generating retract messages for unbounded groupBy
3. implement functions for handling retract messages for different aggregates.
4. handle retraction messages in CommonCorrelate and CommonCalc (retain Delete property).
Note: Currently, only unbounded groupby generates retraction and it is working under unbounded and processing time mode. Hence, retraction is only supported for unbounded and processing time aggregations so far. We can add more retraction support later.
supported now: unbounded groupby, unbounded and processing time over window
unsupported now: group window, event time or bounded over window.