For MOR, when no merging is performed there is no point in reading either primary-key or pre-combine-key values (unless query is referencing these). Avoiding reading these allows to potentially save substantial resources wasted for reading it out.
For MOR, when no merging is performed there is no point in reading either primary-key or pre-combine-key values (unless query is referencing these). Avoiding reading these allows to potentially save substantial resources wasted for reading it out.