[jira] [Created] (FLINK-11973) computeSelfCost method should not return null to avoid NPE

[godfrey he (JIRA)]

godfrey he created FLINK-11973:
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             Summary: computeSelfCost method should not return null to avoid NPE
                 Key: FLINK-11973
                 URL: https://issues.apache.org/jira/browse/FLINK-11973
             Project: Flink
          Issue Type: New Feature
          Components: SQL / Planner
            Reporter: godfrey he
            Assignee: godfrey he


Currently, many `computeSelfCost` methods return null if some kind of metadata 
is unavailable. That will throw NPE in Calcite.



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