Alexander Alexandrov created FLINK-1464:
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Summary: Added ResultTypeQueryable interface to TypeSerializerInputFormat.
Key: FLINK-1464
URL:
https://issues.apache.org/jira/browse/FLINK-1464 Project: Flink
Issue Type: Improvement
Components: Distributed Runtime, Optimizer
Affects Versions: 0.8, 0.9, 0.8.1
Reporter: Alexander Alexandrov
Assignee: Alexander Alexandrov
Priority: Minor
Fix For: 0.9, 0.8.1
It is currently impossible to use the {{TypeSerializerInputFormat}} with generic Tuple types.
For example, [this example gist|
https://gist.github.com/aalexandrov/90bf21f66bf604676f37] fails with a
{quote}
Exception in thread "main" org.apache.flink.api.common.InvalidProgramException: The type returned by the input format could not be automatically determined. Please specify the TypeInformation of the produced type explicitly.
at org.apache.flink.api.java.ExecutionEnvironment.readFile(ExecutionEnvironment.java:341)
at SerializedFormatExample$.main(SerializedFormatExample.scala:48)
at SerializedFormatExample.main(SerializedFormatExample.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
{quote}
exaception.
To fix the issue, I changed the constructor to take a {{TypeInformation<T>}} instad of a {{TypeSerializer<T>}} argument. If this is indeed a bug, I think that this is a good solution.
Unfortunately the fix breaks the API. Feel free to change it if you find a more elegant solution compatible with the 0.8 branch.
The suggested fix can be found in the GitHub [PR#349|
https://github.com/apache/flink/pull/349].
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