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[jira] [Created] (FLINK-11220) Can not Select row time field in JOIN query

sunjincheng created FLINK-11220:

             Summary: Can not Select row time field in JOIN query
                 Key: FLINK-11220
             Project: Flink
          Issue Type: Bug
          Components: Table API & SQL
    Affects Versions: 1.8.0
            Reporter: sunjincheng

Orders...toTable(tEnv, 'orderId, 'orderTime.rowtime)
Payment...toTable(tEnv, 'orderId, 'payTime.rowtime)

SELECT orderTime, o.orderId, payTime
  FROM Orders AS o JOIN Payment AS p
  ON o.orderId = p.orderId AND
     p.payTime BETWEEN orderTime AND orderTime + INTERVAL '1' HOUR



org.apache.flink.table.api.TableException: Found more than one rowtime field: [orderTime, payTime] in the table that should be converted to a DataStream.
Please select the rowtime field that should be used as event-time timestamp for the DataStream by casting all other fields to TIMESTAMP.

at org.apache.flink.table.api.StreamTableEnvironment.translate(StreamTableEnvironment.scala:906)

The reason for the error is that we have 2 time fields `orderTime` and  `payTime`.  I think we do not  need throw the exception, and we can remove the logic of `plan.process(new OutputRowtimeProcessFunction[A](conversion, rowtimeFields.head.getIndex))`, if we want using the timestamp after toDataSteram, we should using `assignTimestampsAndWatermarks()`.

What do you think ? [~twalthr] [~fhueske] 

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