LeoWangLZ created CALCITE-2204: ---------------------------------- Summary: Volcano Planner may not choose the cheapest cost of plan wrongly Key: CALCITE-2204 URL: https://issues.apache.org/jira/browse/CALCITE-2204 Project: Calcite Issue Type: Bug Reporter: LeoWangLZ Assignee: Julian Hyde
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 parent s 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)