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https://issues.apache.org/jira/browse/CALCITE-2204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16818505#comment-16818505
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LeoWangLZ commented on CALCITE-2204:
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[~danny0405] The bug is some different with CALCITE-2018 , it may be loop so it
skip to calculate the cost and lost the best plan while propagate to calculate
cost
> 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.
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