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https://issues.apache.org/jira/browse/FLINK-18836?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dian Fu updated FLINK-18836:
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Issue Type: Bug (was: Improvement)
> Python UDTF doesn't work well when the return type isn't generator
> ------------------------------------------------------------------
>
> Key: FLINK-18836
> URL: https://issues.apache.org/jira/browse/FLINK-18836
> Project: Flink
> Issue Type: Bug
> Components: API / Python
> Affects Versions: 1.11.0
> Reporter: Dian Fu
> Priority: Major
> Fix For: 1.12.0, 1.11.2
>
>
> For the following Python UDTF which return type is not a generator:
> {code}
> # test specify the input_types
> @udtf(input_types=[DataTypes.BIGINT()],
> result_types=[DataTypes.BIGINT(), DataTypes.BIGINT(),
> DataTypes.BIGINT()])
> def split(x):
> return Row(10, 10, 10)
> {code}
> When used in a job, the operator containing the UDTF will not emit data to
> the downstream operator and there is also no exception thrown. The job just
> finished without any result.
> We should properly handle this case: either support this use case or throw a
> proper exception if we don't want to support this case.
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