LiShuMing commented on issue #1457: [WIP][Prototype][CALCITE-3340] TUMBLE as a TableFunction URL: https://github.com/apache/calcite/pull/1457#issuecomment-535304184 Is that possible that we don't change the `Parser.jj` so that use `TUMBLE/HOP` just like `UDF/Table Function`? So as the paper says, maybe users can extend the TableFunction later.
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