[jira] [Created] (FLINK-5662) Alias in front of output fails

[Timo Walther (JIRA)]

Timo Walther created FLINK-5662:
-----------------------------------

             Summary: Alias in front of output fails
                 Key: FLINK-5662
                 URL: https://issues.apache.org/jira/browse/FLINK-5662
             Project: Flink
          Issue Type: Bug
          Components: Table API & SQL
            Reporter: Timo Walther


Neither of the following snippets works:

{code}
public static void main(String[] args) throws Exception {
        final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();

        DataSet<String> text = ...
        BatchTableEnvironment tEnv = TableEnvironment.getTableEnvironment(env);

//      Table t = tEnv.fromDataSet(text, "text").select("text AS line");
//      Table t = tEnv.fromDataSet(text, "text").as("line");
        Table t = tEnv.fromDataSet(text, "text").select("text AS 
line").select("line AS line");

        tEnv.toDataSet(t, MyPojo.class).print();
}

public static class MyPojo {
        public String line;
}
{code}

{code}
Exception in thread "main" org.apache.flink.table.api.TableException: POJO does 
not define field name: text
        at 
org.apache.flink.table.typeutils.TypeConverter$$anonfun$2.apply(TypeConverter.scala:85)
        at 
org.apache.flink.table.typeutils.TypeConverter$$anonfun$2.apply(TypeConverter.scala:81)
        at scala.collection.immutable.List.foreach(List.scala:318)
        at 
org.apache.flink.table.typeutils.TypeConverter$.determineReturnType(TypeConverter.scala:81)
        at 
org.apache.flink.table.plan.nodes.dataset.BatchScan.convertToExpectedType(BatchScan.scala:69)
        at 
org.apache.flink.table.plan.nodes.dataset.DataSetScan.translateToPlan(DataSetScan.scala:61)
        at 
org.apache.flink.table.api.BatchTableEnvironment.translate(BatchTableEnvironment.scala:305)
        at 
org.apache.flink.table.api.BatchTableEnvironment.translate(BatchTableEnvironment.scala:289)
        at 
org.apache.flink.table.api.java.BatchTableEnvironment.toDataSet(BatchTableEnvironment.scala:146)
        at groupId.WordCount.main(WordCount.java:67)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
{code}



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