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https://issues.apache.org/jira/browse/FLINK-7337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16117025#comment-16117025
 ] 

ASF GitHub Bot commented on FLINK-7337:
---------------------------------------

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

    https://github.com/apache/flink/pull/4488#discussion_r131713099
  
    --- Diff: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/CodeGenerator.scala
 ---
    @@ -1104,6 +1106,19 @@ abstract class CodeGenerator(
         }
       }
     
    +  private[flink] def generateStreamRecordTimestampAcccess(): 
GeneratedExpression = {
    +    val resultTerm = newName("result")
    +    val nullTerm = newName("isNull")
    +
    +    val accessCode =
    +      s"""
    +         |long $resultTerm = $contextTerm.timestamp();
    --- End diff --
    
    This could lead to a NPE, I would reintroduce the exception from 
`generateRecordTimestamp`.


> Refactor handling of time indicator attributes
> ----------------------------------------------
>
>                 Key: FLINK-7337
>                 URL: https://issues.apache.org/jira/browse/FLINK-7337
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API & SQL
>    Affects Versions: 1.4.0
>            Reporter: Fabian Hueske
>            Assignee: Fabian Hueske
>
> After a [discussion on the dev mailing 
> list|https://lists.apache.org/thread.html/735d55f9022df8ff73566a9f1553e14be94f8443986ad46559b35869@%3Cdev.flink.apache.org%3E]
>  I propose the following changes to the current handling of time indicator 
> attributes:
> * Remove the separation of logical and physical row type.
> ** Hold the event-time timestamp as regular Long field in Row
> ** Represent the processing-time indicator type as a null-valued field in Row 
> (1 bit overhead)
> * Remove materialization of event-time timestamps because timestamp is 
> already accessible in Row.
> * Add {{ProcessFunction}} to set timestamp into the timestamp field of a 
> {{StreamRecord}}.



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