twalthr commented on issue #6282: [FLINK-6847][FLINK-6813] [table] TimestampDiff table api and sql support URL: https://github.com/apache/flink/pull/6282#issuecomment-410635847 Sorry @xueyumusic you are right. I thought `TIMESTAMPDIFF` is similar to `TIMESTAMPADD`. But actually the parameters and logic is quite different. So yes, we should have a syntax `timestampDiff(TimeIntervalUnit.DAY, '2018-07-03'.toDate, '2018-07-04'.toDate)` instead.
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