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https://issues.apache.org/jira/browse/CALCITE-4655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17365511#comment-17365511
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Ulrich Kramer commented on CALCITE-4655:
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I created a [PR-2441|https://github.com/apache/calcite/pull/2441]
> NullPointerException in JdbcTable.scan
> --------------------------------------
>
> Key: CALCITE-4655
> URL: https://issues.apache.org/jira/browse/CALCITE-4655
> Project: Calcite
> Issue Type: Improvement
> Affects Versions: 1.26.0, 1.27.0
> Reporter: Ulrich Kramer
> Priority: Major
>
> Calling {{JdbcTable.scan}} will result in a {{NullPointerException}} because
> inside {{JdbcTable.fieldClasses}} {{protoRowType}} is null.
> This could easily be fixed by replacing
> {code:java}
> final RelDataType rowType = requireNonNull(protoRowType,
> "protoRowType").apply(typeFactory);
> {code}
> with
> {code:java}
> final RelDataType rowType = getRowType(typeFactory);
> {code}
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