[ https://issues.apache.org/jira/browse/CALCITE-2204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16817167#comment-16817167 ]
Danny Chan commented on CALCITE-2204: ------------------------------------- There are many problems that are addressed in CALCITE-2018, i think this issue is subset of it, maybe we should close this issue. > 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)