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https://issues.apache.org/jira/browse/CALCITE-4915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17979240#comment-17979240
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Julian Hyde commented on CALCITE-4915:
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I don’t know. My guess is that many things stop working if you disable
expansion.
> Query with unqualified common column and NATURAL JOIN fails
> -----------------------------------------------------------
>
> Key: CALCITE-4915
> URL: https://issues.apache.org/jira/browse/CALCITE-4915
> Project: Calcite
> Issue Type: Bug
> Reporter: Aleksey Plekhanov
> Assignee: Aleksey Plekhanov
> Priority: Major
> Labels: pull-request-available
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> Query with unqualified common column and NATURAL JOIN:
> {noformat}
> SELECT deptno FROM emp NATURAL JOIN dept{noformat}
> Fails with "Column 'DEPTNO' is ambiguous" error.
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