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https://issues.apache.org/jira/browse/CALCITE-4319?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17210138#comment-17210138
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Vladimir Sitnikov commented on CALCITE-4319:
--------------------------------------------
[~FatLittle], [~hyuan], do you think this NPE is plausible?
Do you know what should be the proper way to handle null convention in
TopDownRuleDriver?
> NPE in TopDownRuleDriver#convert when convention is not enabled
> ---------------------------------------------------------------
>
> Key: CALCITE-4319
> URL: https://issues.apache.org/jira/browse/CALCITE-4319
> Project: Calcite
> Issue Type: Sub-task
> Components: core
> Reporter: Vladimir Sitnikov
> Priority: Major
>
> {code:java} VolcanoRuleMatch match = ruleQueue.popMatch(
> Pair.of(rel,
> m -> m.getRule() instanceof ConverterRule
> &&
> m.getRule().getOutTrait().satisfies(group.getTraitSet().getConvention())));
> {code}
> satisfies(null) fails with NPE
> see
> https://github.com/apache/calcite/blob/532f903fe495d741053619c13a51537e57dcd619/core/src/main/java/org/apache/calcite/plan/volcano/TopDownRuleDriver.java#L586
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