PartialUpsertMerger (Pinot local segment implementations 0.12.1 API)

All Known Implementing Classes:

AppendMerger, IgnoreMerger, IncrementMerger, MaxMerger, MinMerger, OverwriteMerger, UnionMerger
```
public interface PartialUpsertMerger
```

- Method Summary
  
  Modifier and Type Method Description
  
  Object merge(Object previousValue, Object currentValue)
  Handle partial upsert merge.

- Method Detail
  - merge
```
Object merge(Object previousValue,
             Object currentValue)
```
    Handle partial upsert merge.
    
    Parameters:
    
    previousValue - the value of given field from the last derived full record during ingestion.
    
    currentValue - the value of given field from the new consumed record.
    
    Returns:
    
    a new value after merge