apache / apache/beam

DataFrame API: Integrate pandas windowing with Beam event-time semantics

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core dataframe dsl improvement P3 python
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Description

pandas has support for [rolling()](https://pandas.pydata.org/pandas-docs/stable/user_guide/window.html) windows. It should be possible to use this within a DataframeTransform and have it apply Beam windowing.

Imported from Jira [BEAM-12131](https://issues.apache.org/jira/browse/BEAM-12131). Original Jira may contain additional context.
Reported by: bhulette.

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