[GitHub] [incubator-doris] morningman opened a new issue #2149: Union node is not executed distributedly

[GitBox <gi...@apache.org>]

morningman opened a new issue #2149: Union node is not executed distributedly
URL: https://github.com/apache/incubator-doris/issues/2149
 
 
   **Describe the bug**
   `select sum(k1) from (select k1 from A union all select k2 from B) t1;`
   
   Even if the result set from subquery t1 is huge, the AggregateNode which
   handling `sum(k1)` will only be processed at one host.
   
   This is because the UnionNode of the subquery is locked in one host, so does its
   parent AggregateNode.
   
   Each UnionNode has an ExchangeNode to receive data from other node. So the UnionNode
   can be executed distributedly

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