[jira] [Created] (CALCITE-1488) ValuesReduceRule doesn't propagate rowType on Project of empty Values

["Gian Merlino (JIRA)" <ji...@apache.org>]

Gian Merlino created CALCITE-1488:
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             Summary: ValuesReduceRule doesn't propagate rowType on Project of 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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