After replacing Arena with MemPool, we can achieve one copy for string value read from segment v2. We can exchange MemPool's chunk between RowBlockV2 and RowBlock. This change only replace Arena, this work will be done in other change list.
After replacing Arena with MemPool, we can achieve one copy for string value read from segment v2. We can exchange MemPool's chunk between RowBlockV2 and RowBlock. This change only replace Arena, this work will be done in other change list.