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https://issues.apache.org/jira/browse/BEAM-12446?focusedWorklogId=721454&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-721454
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ASF GitHub Bot logged work on BEAM-12446:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 05/Feb/22 12:41
Start Date: 05/Feb/22 12:41
Worklog Time Spent: 10m
Work Description: github-actions[bot] commented on pull request #14950:
URL: https://github.com/apache/beam/pull/14950#issuecomment-1030616441
This pull request has been marked as stale due to 60 days of inactivity. It
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Issue Time Tracking
-------------------
Worklog Id: (was: 721454)
Time Spent: 20m (was: 10m)
> Wrong process function arg order cause unexpected runtime value shift
> ---------------------------------------------------------------------
>
> Key: BEAM-12446
> URL: https://issues.apache.org/jira/browse/BEAM-12446
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Reporter: Yichi Zhang
> Priority: P3
> Time Spent: 20m
> Remaining Estimate: 0h
>
> if kw args of process function are declared before DnFnParam placeholders the
> fulfillment will shift to wrong index unexpectedly.
> For example if process has signature
> {code:java}
> def process(element, an_arg='x', w=DoFn.WindowParam):
> window_start_1 = an_arg.start // this is ok, though unexpectedly
> window_start_2 = w.start // this is not ok, also unexpectedly, value of w
> is shifted onto an_arg, and w is DoFn.WindowParam, it throws exception
> _DoFnParam has no attribute 'start'.
>
> ...{code}
> at runtime the window param will be mapped onto 'an_arg' instead of w, and w
> will not be replaced with runtime value, causing confusing behaviors. (e.g.
> an_arg will be an instance of GlobalWindow or FixedWindow but w is still
> DoFn.WindowParam).
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