apache / apache/beam

Python SDK should accept a WindowMappingFn in AsIter, AsSingleton, ...

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core improvement P3 python
Dominant language
Java
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Description

Imported from Jira [BEAM-2133](https://issues.apache.org/jira/browse/BEAM-2133). Original Jira may contain additional context.
Reported by: robertwb.

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Research direction

The issue names the Python SDK transforms AsIter and AsSingleton and the WindowMappingFn concept, but provides no files or tests. Start by locating those transform entry points and existing tests for window mapping, then determine the expected behavior from the linked BEAM-2133 Jira issue. Done means the affected transforms accept WindowMappingFn with coverage for the intended behavior.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
data-engineering
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
30/100

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