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_r333354648
##########
File path: flink-python/pyflink/table/tests/test_udf.py
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@@ -204,6 +204,26 @@ def eval(self, col):
self.t_env.register_function(
"non-callable-udf", udf(Plus(), DataTypes.BIGINT(),
DataTypes.BIGINT()))
+ def test_no_argument_deterministic_udf(self):
+ @udf(input_types=[], result_type=DataTypes.BIGINT())
+ def one():
+ return 1
+
+ self.t_env.register_function(
+ "one", one)
+ self.t_env.register_function("add", add)
+
+ table_sink = source_sink_utils.TestAppendSink(['a', 'b'],
+ [DataTypes.BIGINT(),
DataTypes.BIGINT()])
+ self.t_env.register_table_sink("Results", table_sink)
+
+ t = self.t_env.from_elements([(1, 2), (2, 5), (3, 1)], ['a', 'b'])
+ t.select("one(), add(a, b)") \
Review comment:
My initial thought was to use the "add" function to test whether the
no-argument UDF can work with normal UDFs. It seems such worries are redundant
so I have remove it in the latest commit.
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