chunweilei edited a comment on issue #1355: [CALCITE-3228] Error while applying rule ProjectScanRule: interpreter URL: https://github.com/apache/calcite/pull/1355#issuecomment-522826785 > Can we please add a few more test cases: This exception only happens when aggregate is simplified to specific project. For instance, 'select id, id from src' would throw an exception if you call `project#getMapping`. So I don't think your proposed case would make a difference.
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