kgyrtkirk opened a new pull request #1116: [CALCITE-2929] Simplification of IS NULL checks are incorrectly assum… URL: https://github.com/apache/calcite/pull/1116 …ing that CAST-s are possible * for non-nullable types the cast was discarded in case of an IS NULL check; so it might resulted in missing errors cast('invalid' as int) IS NULL * in case of non-nullable types; IS NULL have made the assumption that cast will not change its nullability (which is true); however it may raise an error - so it can't be removed.
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