HuangXingBo commented on a change in pull request #17091:
URL: https://github.com/apache/flink/pull/17091#discussion_r699876652
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File path: flink-python/pyflink/fn_execution/utils/operation_utils.py
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@@ -16,8 +16,8 @@
# limitations under the License.
################################################################################
import datetime
-from collections import Iterable
from functools import partial
+from types import GeneratorType
Review comment:
change to `from collections import Generator`
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