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https://issues.apache.org/jira/browse/CALCITE-4217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17189667#comment-17189667
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Julian Hyde commented on CALCITE-4217:
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Yes it will do harm. People who are trying to treat a cross type as a struct
need to know that they are doing the wrong thing.
> RelCrossType#isStruct should be true rather than false
> ------------------------------------------------------
>
> Key: CALCITE-4217
> URL: https://issues.apache.org/jira/browse/CALCITE-4217
> Project: Calcite
> Issue Type: Sub-task
> Components: core
> Affects Versions: 1.25.0
> Reporter: Vladimir Sitnikov
> Priority: Major
>
> Currently RelCrossType#isStruct returns false even though the default
> implementation in {{org.apache.calcite.rel.type.RelDataTypeImpl#isStruct}} is
> {{return fieldList != null}}
> That results in {{getFieldList}} throwing assertion error (because it asserts
> {{isStruct}}), however RelCrossType#getFieldNames works OK because it asserts
> {{fieldList != null}}
> I think it should be OK if we remove {{isStruct() { return false; } }}
> override and use {{isStruct}} assertion in both {{getFieldList}} and
> {{getFieldNames}}
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