ClassCastException when using RowTypeInfo

[madan <ma...@gmail.com>]

Hi,

Below is sample code I am trying with,

StreamExecutionEnvironment env = StreamExecutionEnvironment.
getExecutionEnvironment();


TypeInformation[] types = new TypeInformation[]
{BasicTypeInfo.INT_TYPE_INFO, BasicTypeInfo.STRING_TYPE_INFO,
        BasicTypeInfo.DOUBLE_TYPE_INFO, BasicTypeInfo.STRING_TYPE_INFO};

String[] fieldNames = new String[]{"id", "name", "salary", "department"};
RowTypeInfo rowTypeInfo = new RowTypeInfo(types, fieldNames);
env.registerType(RowTypeInfo.class);

env.addSource(new EmployeeSourceFunction(), "samplesource", rowTypeInfo)
        .keyBy("department").sum("salary").addSink(new PrintSinkFunction<>());


public class EmployeeSourceFunction implements SourceFunction<Row> {
    private boolean continueRead = true;

    @Override
    public void run(SourceContext<Row> ctx) throws Exception {
        while (continueRead) {
            for (int i = 0; i < 3 && continueRead; i++) {
                Row row = new Row(4);
                row.setField(0, Integer.valueOf(i));
                row.setField(1, String.valueOf("user" + i));
                row.setField(2, 1000 * i);
                row.setField(3, "DEV");
                ctx.collect(row);
            }
            continueRead = false;
        }
    }

    @Override
    public void cancel() {
        continueRead = false;
    }
}


And I am getting below exception

java.lang.ClassCastException:
org.apache.flink.api.java.typeutils.RowTypeInfo cannot be cast to
org.apache.flink.api.java.typeutils.TupleTypeInfo
at
org.apache.flink.streaming.util.typeutils.FieldAccessorFactory.getAccessor(FieldAccessorFactory.java:167)


I have checked FieldAccessorFactory.java:167,

if (typeInfo.isTupleType()) {
   TupleTypeInfo tupleTypeInfo = (TupleTypeInfo) typeInfo;

RowTypeInfo returns 'true' for isTupleType() and cannot be casted.


Can someone please tell me, Is it that I have done wrong configuration or
bug in code ?


-- 
Thank you,
Madan.

Re: ClassCastException when using RowTypeInfo

[Timo Walther <tw...@apache.org>]

Hi Madan,

this is definitely a bug. The Row type has mostly been added for the 
Table & SQL API and has not tested for expression keys. But in general I 
would use a tuple in your case as they are more efficient. The 
`registerType` is only necessary for generic types serialized with Kryo.

I opened https://issues.apache.org/jira/browse/FLINK-8255. If you would 
like to fix it, I can assign it to you.

Thanks.

Regards,
Timo



Am 12/13/17 um 4:16 PM schrieb madan:
> Hi,
>
> Below is sample code I am trying with,
>
> StreamExecutionEnvironment env = 
> StreamExecutionEnvironment.getExecutionEnvironment();
> TypeInformation[] types =new TypeInformation[] {BasicTypeInfo.INT_TYPE_INFO, BasicTypeInfo.STRING_TYPE_INFO,
>          BasicTypeInfo.DOUBLE_TYPE_INFO, BasicTypeInfo.STRING_TYPE_INFO};
>
> String[] fieldNames =new String[]{"id","name","salary","department"};
> RowTypeInfo rowTypeInfo =new RowTypeInfo(types, fieldNames);
> env.registerType(RowTypeInfo.class);
>
> env.addSource(new EmployeeSourceFunction(),"samplesource", rowTypeInfo)
>          .keyBy("department").sum("salary").addSink(new PrintSinkFunction<>());
>
> public class EmployeeSourceFunctionimplements SourceFunction<Row> {
>      private boolean continueRead =true;
>
>      @Override public void run(SourceContext<Row> ctx)throws Exception {
>          while (continueRead) {
>              for (int i =0; i <3 &&continueRead; i++) {
>                  Row row =new Row(4);
>                  row.setField(0, Integer.valueOf(i));
>                  row.setField(1, String.valueOf("user" + i));
>                  row.setField(2,1000 * i);
>                  row.setField(3,"DEV");
>                  ctx.collect(row);
>              }
>              continueRead =false;
>          }
>      }
>
>      @Override public void cancel() {
>          continueRead =false;
>      }
> }
>
> And I am getting below exception
>
> java.lang.ClassCastException: 
> org.apache.flink.api.java.typeutils.RowTypeInfo cannot be cast to 
> org.apache.flink.api.java.typeutils.TupleTypeInfo
> at 
> org.apache.flink.streaming.util.typeutils.FieldAccessorFactory.getAccessor(FieldAccessorFactory.java:167)
>
>
> I have checked FieldAccessorFactory.java:167,
> if (typeInfo.isTupleType()) {
>     TupleTypeInfo tupleTypeInfo = (TupleTypeInfo) typeInfo;
> RowTypeInfo returns 'true' for isTupleType() and cannot be casted.
>
>
> Can someone please tell me, Is it that I have done wrong configuration 
> or bug in code ?
>
>
> -- 
> Thank you,
> Madan.