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https://issues.apache.org/jira/browse/BEAM-1561?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15892897#comment-15892897
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Ahmet Altay commented on BEAM-1561:
-----------------------------------
This is expected, because _UnwindowedValues values may not necessarily fir in
memory. If the user knows this is the case, converting to list will work
faster.
> Iterating over _UnwindowedValues is slow
> ----------------------------------------
>
> Key: BEAM-1561
> URL: https://issues.apache.org/jira/browse/BEAM-1561
> Project: Beam
> Issue Type: Bug
> Components: sdk-py
> Reporter: Ahmet Altay
>
> User reported issue
> """
> Iterating over it (multiple times) is very slow, which goes away after
> converting it to a list via
> user_data = list(user_data)
> """
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