xy2953396112 commented on issue #1635: [CALCITE-3570] Support MutableSnapshot in MutableRel URL: https://github.com/apache/calcite/pull/1635#issuecomment-569569291 > Can you explain in what scenario `MutableSnapshot` is needed ? Since it's not supported in SubstitutionVisitor at this moment. i think it should be supported. such as: query: `SELECT * FROM emps FOR SYSTEM_TIME AS OF TIMESTAMP '2019-12-30 12:34:56'` mv: `SELECT * FROM emps FOR SYSTEM_TIME AS OF TIMESTAMP '2019-12-30 12:34:56'` in this case, it should be matched. How do you think ？
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