IncrementMerger (Pinot local segment implementations 0.11.0 API)

java.lang.Object
- org.apache.pinot.segment.local.upsert.merger.IncrementMerger

All Implemented Interfaces:

PartialUpsertMerger
```
public class IncrementMerger
extends Object
implements PartialUpsertMerger
```
Merges 2 records and returns the merged record. Add the new value from incoming row to the existing value from numeric field. Then return the merged record.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Object`	`merge(Object previousValue, Object currentValue)`	Increment the new value from incoming row to the given field of previous record.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - merge
```
public Object merge(Object previousValue,
                    Object currentValue)
```
    Increment the new value from incoming row to the given field of previous record.
    
    Specified by:
    
    merge in interface PartialUpsertMerger
    
    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