XuMingmin commented on issue #1253: [CALCITE-3073] Support read from special timestamp in KafkaAdapter URL: https://github.com/apache/calcite/pull/1253#issuecomment-499517717 @wangzzu thanks to prepare it quickly, the implementation is a bit different from my thought. FYI my idea, `KAFKA_TIMESTAMP` is a reserved keyword in KafkaAdapter, given a query like `SELECT * FROM KAFKA_TABLE WHERE KAFKA_TIMESTAMP > CURRENT_TIMESTAMP-1`, KafkaAdapter would take the filter clause `KAFKA_TIMESTAMP > CURRENT_TIMESTAMP-1` directly. In this way, users do not change table definition again and again, the only question is, is it good to have the reserved keyword, and how. (for HOW, we may have the column by default in `KafkaRowConverter`) @danny0405 @asereda-gs any comments?
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