Github user twalthr commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4532#discussion_r132819174
  
    --- Diff: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/StreamTableEnvironment.scala
 ---
    @@ -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 --
    
    This is a very good question. I don't know how we want to solve the `SELECT 
*` problem. My initial idea was to just the attribute of the left table as a 
time indicator. Another idea would be to remove all time indicators and 
explicitly choose one attribute `SELECT TIME(OrderA.rowtime)`. Still not 
perfect. We need to discuss this. @fhueske what do you think?



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