WeiZhong94 commented on a change in pull request #9865: [FLINK-14212][python]
Support no-argument Python UDFs.
URL: https://github.com/apache/flink/pull/9865#discussion_r333381690
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File path: flink-python/pyflink/table/tests/test_udf.py
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@@ -204,6 +204,28 @@ def eval(self, col):
self.t_env.register_function(
"non-callable-udf", udf(Plus(), DataTypes.BIGINT(),
DataTypes.BIGINT()))
+ def test_udf_without_arguments(self):
+ @udf(input_types=[], result_type=DataTypes.BIGINT(),
deterministic=True)
Review comment:
1. In current design it will throw an exception if we don't declare
input_types. And IMO the lack of input_types should not be considered as a
no-argument UDF. It means we should infer the input types when the UDF is
called.
2. I have replaced current UDFs with lambda in the latest commit.
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