ColumnValueSwapper (druid-processing 28.0.0 API)

```
public interface ColumnValueSwapper
```
A semantic interface for use with Column objects. This is used to swap values inside of a column. Note that this interface fundamentally mutates the underlying column. If a column cannot support mutation, it should not return return an implementation of this interface.

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  void swapValues(int lhs, int rhs)
  Swaps the values at the two row ids.

- Method Detail
  - swapValues
```
void swapValues(int lhs,
                int rhs)
```
    Swaps the values at the two row ids. There is no significant to "right" and "left", it's just easier to name the parameters that way.
    
    Parameters:
    
    lhs - the left-hand-side rowId
    
    rhs - the right-hand-side rowId