Feature Request: RangeMerge Support
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Description
Now RocksDB has feature `RangeDelete` and `MergeOperator`, these concepts can be extended:
## RangeMerge support
With range merge, we can optimize range update on DB, such as:
```sql
UPDATE SomeTable
SET SomeColumn = SomeColumn + 1
WHERE id > SomeLowerBound AND id < SomeUpperBound
```
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