[
https://issues.apache.org/jira/browse/FLINK-5662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15859445#comment-15859445
]
ASF GitHub Bot commented on FLINK-5662:
---------------------------------------
Github user KurtYoung commented on a diff in the pull request:
https://github.com/apache/flink/pull/3277#discussion_r100297140
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/nodes/datastream/DataStreamRel.scala
---
@@ -19,27 +19,20 @@
package org.apache.flink.table.plan.nodes.datastream
import org.apache.calcite.rel.RelNode
-import org.apache.flink.api.common.typeinfo.TypeInformation
-import org.apache.flink.table.plan.nodes.FlinkRel
import org.apache.flink.streaming.api.datastream.DataStream
import org.apache.flink.table.api.StreamTableEnvironment
+import org.apache.flink.table.plan.nodes.FlinkRel
+import org.apache.flink.types.Row
trait DataStreamRel extends RelNode with FlinkRel {
/**
* Translates the FlinkRelNode into a Flink operator.
*
* @param tableEnv The [[StreamTableEnvironment]] of the translated
Table.
- * @param expectedType specifies the type the Flink operator should
return. The type must
- * have the same arity as the result. For instance,
if the
- * expected type is a RowTypeInfo this method will
return a DataSet of
- * type Row. If the expected type is Tuple2, the
operator will return
- * a Tuple2 if possible. Row otherwise.
* @return DataStream of type expectedType or RowTypeInfo
--- End diff --
DataStream of Row
> 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
> Affects Versions: 1.2.0
> Reporter: Timo Walther
> Assignee: 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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