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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