hequn8128 commented on issue #6282: [FLINK-6847][FLINK-6813] [table] TimestampDiff table api and sql support URL: https://github.com/apache/flink/pull/6282#issuecomment-410492932 It seems the `-` arithmetic is not very convenient for users. Maybe we need the `timestampDiff ` function? @twalthr @xueyumusic
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