danny0405 commented on issue #1811: [CALCITE-3789] Support validation of UNNEST multiple array columns like Presto URL: https://github.com/apache/calcite/pull/1811#issuecomment-598983239 > > We should also add a test case for at least one SqlToRelConverterTest. > > Will do it in the future if needed. I am still unclear that how this should be represented as RelNode. (discussed in https://issues.apache.org/jira/browse/CALCITE-3787) > > Is it OK for you? > > EDIT: Some other reasons: > > 1. We still plan to communicate with Presto using SQL. > 2. RelNode -> SqlNode is not quite mature I believe, but I may be wrong there. > 3. The optimization enabled by RelNode is helpful. But not a high-pri since Presto will also optimize the internal execution plan. Usually we have 2 kinds of use cases for Calcite: - Generates RelNode/RexNode to adapter other downstream planners - Generates RelNode/RexNode and unparse it as special SQL dialect to interpretation through JDBC. Either way we should generates a working plan, that is why I suggest to add SqlToRel test. For more general, we should add operator test and SQL ITCase if we change an operator semantics. But for you case, I think a SqlToRelConverter test is okey.
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