amaliujia edited a comment on issue #1587: [CALCITE-3272] Support TUMBLE as Table Valued Function including an enumerable implementation, stream.iq and DESCRIPTOR URL: https://github.com/apache/calcite/pull/1587#issuecomment-568416284 just removed the unnecessary changes in OperandTypes and ReturnTypes. - For SqlParserTest. Added a few more tests related to `DESCRIPTOR`. There is no obvious parser negative syntax so didn't add any. Table functions are already tested so didn't add any either. - For SqlValidatorTest. Tested incorrect signatures of `TUMBLE`. - SqlToRelConverterTest. Added a test to test generated plan.
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