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https://issues.apache.org/jira/browse/CALCITE-2023?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16224488#comment-16224488
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lincoln.lee commented on CALCITE-2023:
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Thanks for your quick reply. I'll try to figure out the incorrect usage in
flink.
> Add SqlKind.AS to policy map of org.apache.calcite.plan.Strong due to NPE
> when apply FilterJoinRule
> ----------------------------------------------------------------------------------------------------
>
> Key: CALCITE-2023
> URL: https://issues.apache.org/jira/browse/CALCITE-2023
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: lincoln.lee
> Assignee: Julian Hyde
> Priority: Minor
>
> Encounter a NPE when apply FilterJoinRule in a [use
> case|https://issues.apache.org/jira/browse/FLINK-7942] written in flink table
> api.
> A simple way to fix this is to change the calcite class
> {code}org.apache.calcite.plan.Strong{code} add an additional entry to the
> EnumMap in createPolicyMap method: {code}map.put(SqlKind.AS,
> Policy.AS_IS);{code}
> But I'm not sure if it is the right way, or there's other root cause?
> @julianhyde could you offer some advice?
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