DefaultColumnHandler (Pinot local segment implementations 1.0.0 API)

All Known Implementing Classes:

BaseDefaultColumnHandler, V1DefaultColumnHandler, V3DefaultColumnHandler
```
public interface DefaultColumnHandler
```

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`needUpdateDefaultColumns()`	Check if there is a need to add/remove/update the auto-generated default columns for the segment, according to the current table schema.
`void`	`updateDefaultColumns()`	Update the auto-generated default columns.

- Method Detail
  - updateDefaultColumns
```
void updateDefaultColumns()
                   throws Exception
```
    Update the auto-generated default columns.
    Supported default column actions include: ADD/UPDATE/REMOVE DIMENSION/METRIC
    
    Throws:
    
    Exception
  - needUpdateDefaultColumns
```
boolean needUpdateDefaultColumns()
```
    Check if there is a need to add/remove/update the auto-generated default columns for the segment, according to the current table schema.
    
    Returns:
    
    true if there is a need to update.