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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