[
https://issues.apache.org/jira/browse/CALCITE-2204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16817170#comment-16817170
]
Chunwei Lei commented on CALCITE-2204:
--------------------------------------
I think we should not close this issue since it is not duplicate with
CALCITE-2018. I would like to explain a bit more about this issue when I find
some time. Thanks for your attention, [~danny0405].
> 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
> Priority: Major
> Labels: pull-request-available
>
> 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.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
