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Support TUMBLE function #20

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@yuemingl

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@yuemingl

More and more SQL engines start supporting streaming functions, like

TUMBLE(rowtime, INTERVAL '1' HOUR)

described here https://calcite.apache.org/docs/stream.html#tumbling-windows-improved

Is it possible to support parameter list like "rowtime, INTERVAL '1' HOUR"?

Other functions like:
DATE_ADD(input_value, INTERVAL quantity_expr unit_of_time)
DATE_SUB(input_value, INTERVAL quantity_expr unit_of_time)

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