xionglei0 commented on issue #1788: add param: doris_exchange_instances to set parallel after exchange URL: https://github.com/apache/incubator-doris/pull/1788#issuecomment-530804492 "parallel_fragment_exec_instance_num" means the parallel during scan_node "doris_exchange_instances" means the parallel after exchange_node when scan datasize much more than datasize after exchange, like udaf : sum，count, doris_exchange_instances is useful
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