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https://issues.apache.org/jira/browse/CALCITE-7043?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17954186#comment-17954186
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Mihai Budiu commented on CALCITE-7043:
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I didn't at the time know that it is actually legal to access ROW fields by
index, e.g., row[1], where row has a ROW type. This is how the bug is triggered.
> Type inferred for SqlItemOperator has incorrect nullability
> -----------------------------------------------------------
>
> Key: CALCITE-7043
> URL: https://issues.apache.org/jira/browse/CALCITE-7043
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.39.0
> Reporter: Mihai Budiu
> Assignee: Mihai Budiu
> Priority: Minor
>
> This issue is related to CALCITE-6764
> Accessing a field within a nullable ROW should always produce a nullable
> result, even if the field itself is not nullable. The previous issue fixed
> this bug in the Validator, but the same problem persists in
> SqlItemOperator.inferReturnType.
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