Optimize memory usage for repartitioning when the distribution type is REPLICATED

[yingsu00]

The PartitionedOutputOperator always populates each partition no matter if it's REPLICATED or PARTITIONED. This is not necessary when it's REPLICATED repartitioning. In such case, we only need to populate one partition so that the memory usage can be dramatically reduced.

[yingsu00]

cc @prestodb/aria @biswapesh

[stale]

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