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Posted to issues@beam.apache.org by "Beam JIRA Bot (Jira)" <ji...@apache.org> on 2021/07/05 17:21:00 UTC
[jira] [Updated] (BEAM-12446) Wrong process function arg order
cause unexpected runtime value shift
[ https://issues.apache.org/jira/browse/BEAM-12446?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Beam JIRA Bot updated BEAM-12446:
---------------------------------
Labels: stale-assigned (was: )
> 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
> Assignee: Yichi Zhang
> Priority: P2
> Labels: stale-assigned
> Time Spent: 10m
> 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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