Shahin Azad created FLINK-4092:
----------------------------------
Summary: Stringify map function's type conversion problem is
breaking running provided example in documents
Key: FLINK-4092
URL: https://issues.apache.org/jira/browse/FLINK-4092
Project: Flink
Issue Type: Bug
Components: DataSet API, Python API
Affects Versions: 1.0.3
Reporter: Shahin Azad
This function definition:
```
def map(self, value):
if isinstance(value, (tuple, list)):
return "(" + b", ".join([self.map(x) for x in value]) + ")"
else:
return str(value)
```
in `/resources/python/flink/plan/DataSet.py` will raise an exception since
implicit type conversion between `String` to `Bytes` is not possible. User will
get following error if he tries to run the wordcount example from the
documentation:
```
File
"/tmp/flink-dist-cache-fb3d569b-c811-4065-acef-32267183aa15/f1b0eb6c0a099b22760f7300760e6e80/flink/flink/plan/Da
taSet.py", line 38, in map
return "(" + b", ".join([self.map(x) for x in value]) + ")"
TypeError: sequence item 0: expected a bytes-like object, str found
at
org.apache.flink.python.api.streaming.data.PythonStreamer.streamBufferWithoutGroups(PythonStreamer.java:269)
at
org.apache.flink.python.api.functions.PythonMapPartition.mapPartition(PythonMapPartition.java:54)
at
org.apache.flink.runtime.operators.MapPartitionDriver.run(MapPartitionDriver.java:98)
at org.apache.flink.runtime.operators.BatchTask.run(BatchTask.java:480)
at
org.apache.flink.runtime.operators.BatchTask.invoke(BatchTask.java:345)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:559)
at java.lang.Thread.run(Thread.java:745)
```
To resolve this issue it's enough to change `b", "` to a normal string by
removing Byte conversion notation.
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