Hello Fabian, Thank you for the suggestion. I see that an issue has been created to support adding custom type information to case classes: https://issues.apache.org/jira/browse/FLINK-7859
Joshua On Oct 17, 2017, at 3:01 AM, Fabian Hueske <fhue...@gmail.com<mailto:fhue...@gmail.com>> wrote: Hi Joshua, that's a limitation of the Scala API. Row requires to explicitly specify a TypeInformation[Row] but it is not possible to inject custom types into a CaseClassTypeInfo, which are automatically generated by a Scala compiler plugin. The probably easiest solution is to use Flink's Java Tuple classes instead of a case class. You can import the Java Tuples with import org.apache.flink.api.java.tuple.{Tuple2 => JTuple2} And create a TupleTypeInfo for example with new TupleTypeInfo(new RowTypeInfo(Types.STRING, Types.LONG), Types.DOUBLE) Best, Fabian 2017-10-16 23:26 GMT+02:00 Joshua Griffith <jgriff...@campuslabs.com<mailto:jgriff...@campuslabs.com>>: Correction: I have the row’s RowTypeInfo at runtime before the job starts. I don’t have RowTypeInfo at compile time. On Oct 16, 2017, at 4:15 PM, Joshua Griffith <jgriff...@campuslabs.com<mailto:jgriff...@campuslabs.com>> wrote: Hello, I have a case class that wraps a Flink Row and I’d like to use fields from that Row in a delta iteration join condition. I only have the row’s fields after the job starts. I can construct RowTypeInfo for the Row but I’m not sure how to add that to Flink’s generated type information for the case class. Without it, I understandably get the following error because Flink doesn’t know the Row’s TypeInformation: org.apache.flink.api.common.InvalidProgramException: This type (GenericType<org.apache.flink.types.Row>) cannot be used as key. Is there a way to manually construct or annotate the type information for the case class to provide the Row’s type information so it can be used in a join? I could alternately replace the case class with a Tuple and construct a TupleTypeInfo but a tuple is more difficult to use than a case class. Thanks, Joshua
