LeoWangLZ created CALCITE-2204:
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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.
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