amaliujia commented on issue #1510: [CALCITE-3418] Grouped Window Function TUMBLE should return "$TUMBLE"… URL: https://github.com/apache/calcite/pull/1510#issuecomment-542986288 @zinking You can find some context from here: https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/sql/fun/SqlStdOperatorTable.java#L2257 There is also additional context in https://jira.apache.org/jira/browse/CALCITE-3382
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