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

    https://github.com/apache/flink/pull/2961#discussion_r91738368
  
    --- Diff: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/table.scala
 ---
    @@ -881,24 +883,21 @@ class GroupWindowedTable(
         * }}}
         */
       def select(fields: Expression*): Table = {
    --- End diff --
    
    At the moment there is no way to specify watermarks inside of a Table API 
or SQL query. This can only be done on a DataStream before it is converted into 
a Table. Therefore, watermarks and timestamps are already assigned before the 
first Table or SQL operator can remove anything. In case of a TableSource which 
assigns timestamps, the TableSource needs to take care that the assignment 
happens before a pushed-down projection is applied.


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