wutiangan opened a new issue #4569:
URL: https://github.com/apache/incubator-doris/issues/4569
**Describe the bug**
a fragment is as bellow:
`
5: broadcast hashNode
3: aggNode 4:exchangeNode
2: shuffle hashNode
0:exchangeNode 1:exchangeNode
`
If the numnodes of the fragment corresponding to 【exchangelode 0】 is 1, the
numnodes of the farament corresponding to 【exchangelode 1】 is also 1, and the
numnode of the fragment corresponding to 【exchangelode 4】 is 4, the parallelism
of this fragment is max (1,1,4) = 4. However, we plan only one aggnode in the
distributed execution planning phase (this is because the numnode of both
leftchildsegment and regithchild segment is 1, we only need one AGG Node).
Since the concurrency of fragment is 4（In Coordinator phase), we need two
layers of aggnode（in distribute planner phase）, but the node of fragment is
already unchangeable。
the query will produce wrong result
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