mxm commented on a change in pull request #12012:
URL: https://github.com/apache/beam/pull/12012#discussion_r440644321
##########
File path: sdks/python/apache_beam/runners/worker/sdk_worker.py
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@@ -941,15 +942,29 @@ def extend(self,
is_cached=False
):
# type: (...) -> _Future
+ # Make sure the input is a list of elements
+ elements = list(elements)
Review comment:
Yes, though we will iterate twice over `elements`. 1) for the cache 2)
for serializing the elements for the runner. Materializing to a list ensures
that the results will be the same. An Iterable could theoretically return
different results.
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