LiShuMing commented on issue #1457: [WIP][Prototype][CALCITE-3340] TUMBLE as a TableFunction URL: https://github.com/apache/calcite/pull/1457#issuecomment-535362156 No, No... `TUMBLE` is a Table Function, not a simple `UDF`. I just doubt how to be better for users to extend `TableFunctions` like `TUMBLE`/`HOP` like the paper said.
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