shuiqiangchen commented on a change in pull request #13097:
URL: https://github.com/apache/flink/pull/13097#discussion_r467721304
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File path: flink-python/pyflink/datastream/tests/test_data_stream.py
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@@ -140,15 +135,68 @@ def flat_map(value):
flat_mapped_stream = ds.flat_map(flat_map,
type_info=Types.ROW([Types.STRING(),
Types.INT()]))
- collect_util = DataStreamCollectUtil()
- collect_util.collect(flat_mapped_stream)
+ self.collect_util.collect(flat_mapped_stream)
self.env.execute('flat_map_test')
- results = collect_util.results()
+ results = self.collect_util.results()
expected = ['a,0', 'bdc,2', 'deeefg,4']
results.sort()
expected.sort()
self.assertEqual(expected, results)
+ def test_key_by(self):
+ element_collection = [('a', 0), ('b', 0), ('c', 1), ('d', 1), ('e', 2)]
+ self.env.set_parallelism(1)
+ ds = self.env.from_collection(element_collection,
+ type_info=Types.ROW([Types.STRING(),
Types.INT()]))
+
+ class AssertKeyMapFunction(MapFunction):
+ def __init__(self):
+ self.pre = None
+
+ def map(self, value):
+ if value[0] == 'b':
+ assert self.pre == 'a'
+ if value[0] == 'd':
+ assert self.pre == 'c'
+ self.pre = value[0]
+ return value
+
+ mapped_stream = ds.key_by(MyKeySelector()).map(AssertKeyMapFunction())
+ self.collect_util.collect(mapped_stream)
+ self.env.execute('key_by_test')
+ results = self.collect_util.results()
+ expected = ["<Row('a', 0)>", "<Row('b', 0)>", "<Row('c', 1)>",
"<Row('d', 1)>",
+ "<Row('e', 2)>"]
+ results.sort()
+ expected.sort()
+ self.assertEqual(expected, results)
+
+ def test_key_by_map(self):
Review comment:
They are almost the same, but the second test is to make sure we have
not changed the original DataStream after key_by() operation with two way map
operation.
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