SupportsRowLevelDelete.RowLevelDeleteInfo (Flink : Table : Common 2.0-preview1 API)

Enclosing interface:

SupportsRowLevelDelete
```
@PublicEvolving
public static interface SupportsRowLevelDelete.RowLevelDeleteInfo
```
The information that guides the planner on how to rewrite the delete statement.

Method Summary

All Methods Instance Methods Default Methods
Modifier and Type	Method	Description
`default SupportsRowLevelDelete.RowLevelDeleteMode`	`getRowLevelDeleteMode()`	Planner will rewrite delete statement to query base on the `SupportsRowLevelDelete.RowLevelDeleteInfo`, keeping the query of delete unchanged by default(in `DELETE_ROWS` mode), or changing the query to the complementary set in REMAINING_ROWS mode.
`default Optional<List<Column>>`	`requiredColumns()`	The required columns by the sink to perform row-level delete.

- Method Detail
  - requiredColumns
```
default Optional<List<Column>> requiredColumns()
```
    The required columns by the sink to perform row-level delete. The rows consumed by sink will contain the required columns in order. If return Optional.empty(), it will contain all columns.
  - getRowLevelDeleteMode
```
default SupportsRowLevelDelete.RowLevelDeleteMode getRowLevelDeleteMode()
```
    Planner will rewrite delete statement to query base on the SupportsRowLevelDelete.RowLevelDeleteInfo, keeping the query of delete unchanged by default(in `DELETE_ROWS` mode), or changing the query to the complementary set in REMAINING_ROWS mode.
    Take the following SQL as an example:
    DELETE FROM t WHERE y = 2;
    
    If returns SupportsRowLevelDelete.RowLevelDeleteMode.DELETED_ROWS, the sink will get the rows to be deleted which match the filter [y = 2].
    If returns SupportsRowLevelDelete.RowLevelDeleteMode.REMAINING_ROWS, the sink will get the rows which don't match the filter [y = 2].
    Note: All rows will be of RowKind#DELETE when RowLevelDeleteMode is DELETED_ROWS, and RowKind#INSERT when RowLevelDeleteMode is REMAINING_ROWS.