Haisheng Yuan resolved CALCITE-2204.
    Fix Version/s: 1.22.0
       Resolution: Duplicate

Fixed in 

> Volcano Planner may not choose the cheapest cost plan 
> ------------------------------------------------------
>                 Key: CALCITE-2204
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2204
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: LeoWangLZ
>            Assignee: Chunwei Lei
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.22.0
> Volcano Planner will propagate the cost improvement to parents that one of 
> the inputs has the best plan. But it not propagate to all parents firstly, it 
> propagate one parent and go to the parents of parent. In the way, if one 
> parent may propagate to other parent on the same level, and the cost maybe 
> less than others, but when propagate the parent again, it will not propagate 
> because the cost is already calculated, and it's can't be less then the cost 
> of the self.

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