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-530809146
 
 
   doris_exchange_instances value need to be set according to your data size 
and UDAF,  we usually configure it when table is duplication model

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