[jira] [Created] (CALCITE-4372) Correct specification getCumulativeCost and getNonCumulativeCost so it should always produce non-nullable value

["Vladimir Sitnikov (Jira)" <ji...@apache.org>]

Vladimir Sitnikov created CALCITE-4372:
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             Summary: Correct specification getCumulativeCost and getNonCumulativeCost so it should always produce non-nullable value
                 Key: CALCITE-4372
                 URL: https://issues.apache.org/jira/browse/CALCITE-4372
             Project: Calcite
          Issue Type: Sub-task
          Components: core
    Affects Versions: 1.26.0
            Reporter: Vladimir Sitnikov
            Assignee: Vladimir Sitnikov


Currently javadoc says {{getNonCumulativeCost}} can return {{null}}, however, a lot of usages assume the resulting value is not null.

For instance, FLINK-11973 is relevant here.

Even though plugins can install custom {{getNonCumulativeCost}} handlers, we should make {{get*CumulativeCost}} non-nullable, so {{RelOptPlanner.getCost}} could be declared and implemented as non-nullable (which is the way the current code behaves)



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