SupportsRowLevelUpdate (Flink : Table : Common 2.0-preview1 API)

```
@PublicEvolving
public interface SupportsRowLevelUpdate
```
Interface for DynamicTableSinks that support update existing data according to row-level changes. The table sink is responsible for telling planner how to produce the row changes, and consuming them to achieve the purpose of row(s) update.
The planner will call method applyRowLevelUpdate(List, RowLevelModificationScanContext) to get the SupportsRowLevelUpdate.RowLevelUpdateInfo returned by sink, and rewrite the update statement based on the retrieved SupportsRowLevelUpdate.RowLevelUpdateInfo to produce rows to DynamicTableSink.

Nested Class Summary

Nested Classes
Modifier and Type	Interface	Description
`static interface`	`SupportsRowLevelUpdate.RowLevelUpdateInfo`	The information that guides the planner on how to rewrite the update statement.
`static class`	`SupportsRowLevelUpdate.RowLevelUpdateMode`	Type of update modes that the sink expects for update purpose.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`SupportsRowLevelUpdate.RowLevelUpdateInfo`	`applyRowLevelUpdate(List<Column> updatedColumns, RowLevelModificationScanContext context)`	Applies row-level update with providing the updated columns and `RowLevelModificationScanContext`, and return `SupportsRowLevelUpdate.RowLevelUpdateInfo`.

- Method Detail
  - applyRowLevelUpdate
```
SupportsRowLevelUpdate.RowLevelUpdateInfo applyRowLevelUpdate(List<Column> updatedColumns,
                                                              @Nullable
                                                              RowLevelModificationScanContext context)
```
    Applies row-level update with providing the updated columns and RowLevelModificationScanContext, and return SupportsRowLevelUpdate.RowLevelUpdateInfo.
    
    Parameters:
    
    updatedColumns - the columns updated by update statement in table column order.
    
    context - the context passed by table source which implement SupportsRowLevelModificationScan. It'll be null if the table source doesn't implement it.