ChangelogFunction.ChangelogContext (Flink : Table : Common 2.1.0 API)

Enclosing interface:

ChangelogFunction
```
@PublicEvolving
public static interface ChangelogFunction.ChangelogContext
```
Context during changelog mode inference.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`ChangelogMode`	`getRequiredChangelogMode()`	Returns the `ChangelogMode` that the framework requires from the function.
`ChangelogMode`	`getTableChangelogMode(int pos)`	Returns information about a table argument's changelog mode.

- Method Detail
  - getTableChangelogMode
```
ChangelogMode getTableChangelogMode(int pos)
```
    Returns information about a table argument's changelog mode.
    
    Returns:
    
    ChangelogMode of the table with set semantics, or null if argument is not a table
  - getRequiredChangelogMode
```
ChangelogMode getRequiredChangelogMode()
```
    Returns the ChangelogMode that the framework requires from the function.
    In particular, it contains information whether RowKind.UPDATE_BEFORE messages are required and ChangelogMode.keyOnlyDeletes() are supported.