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ClassCastException when using RowTypeInfo

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madan

ClassCastException when using RowTypeInfo

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.

Timo Walther

Re: ClassCastException when using RowTypeInfo

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,