vlsi edited a comment on issue #1593: [CALCITE-3513] Unify TableFunction implementor's NullPolicy and its behavior URL: https://github.com/apache/calcite/pull/1593#issuecomment-576531353 > Vladimir, did you check what happens if a table function returns null and it is an argument to a consuming table function? `null` argument is just a null argument. Arguments are never converted to an empty relation. Note: Oracle schema does not make the distinction between `regular functions` and `table functions`. A function can be used as a table function if it returns a collection. However, the very same function can be used in `SELECT` or in `PL/SQL`, and `null` values are allowed for collections. So I think it should be fine to return null from Calcite's table function, however, the executor should treat `table(null)` as an empty relation of the appropriate type.
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