xionglei0 opened a new pull request #1788: add param: doris_exchange_instances to set parallel after exchange URL: https://github.com/apache/incubator-doris/pull/1788 doris_exchange_instances speed up the query especially useful when: 1. data size decrease on a massive scale after exchange when using aggregation function or UDAF 2. cluster is large but we only need several instances to do aggregation. save computational resources
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