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https://issues.apache.org/jira/browse/CALCITE-1488?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde updated CALCITE-1488:
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Summary: ValuesReduceRule should ignore empty Values (was:
ValuesReduceRule doesn't propagate rowType on Project of empty Values)
> ValuesReduceRule should ignore empty Values
> -------------------------------------------
>
> Key: CALCITE-1488
> URL: https://issues.apache.org/jira/browse/CALCITE-1488
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.10.0
> Reporter: Gian Merlino
> Assignee: Julian Hyde
>
> If ValuesReduceRule is trying to reduce a Project on top of an empty Values,
> then changeCount ends up 0, and it returns the underlying Values. This leads
> to an assertion failure because the returned Values does not have the
> expected rowType.
> One way to fix this is changing the "Filter had no effect" logic from
> "changeCount == 0" to "changeCount == 0 && projectExprs == null".
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