Github user xccui commented on a diff in the pull request:
    --- Diff: 
    @@ -667,30 +719,62 @@ abstract class StreamTableEnvironment(
         // get CRow plan
         val plan: DataStream[CRow] = translateToCRow(logicalPlan, queryConfig)
    +    val rowtimeFields = logicalType
    +      .getFieldList.asScala
    +      .filter(f => FlinkTypeFactory.isRowtimeIndicatorType(f.getType))
    +    // convert the input type for the conversion mapper
    +    // the input will be changed in the OutputRowtimeProcessFunction later
    +    val convType = if (rowtimeFields.size > 1) {
    +      throw new TableException(
    --- End diff --
    Thanks for the PR, @fhueske and @twalthr . I tried to rebase my rowtime 
join codes on this branch, but encountered this exception. The test SQL is 
`SELECT * FROM OrderA, OrderB WHERE OrderA.productA = OrderB.productB AND 
OrderB.rtB BETWEEN OrderA.rtA AND OrderA.rtA + INTERVAL '2' SECOND`. What 
should I do to *cast all other fields to TIMESTAMP*.

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