[Story][FEA] Grouped range-window support in cuDF-Polars
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cudf-polars
feature request
- Dominant language
- C++
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Description
This story tracks grouped range-window features in cudf-polars. These features all involve window bounds defined by an index/order column within each group.
**Action Items**:
- Dynamic groupby (#17144)
- Grouped `LazyFrame.rolling` (#23590)
- Grouped rolling via `over`
- First pass: Small-group support (#23606)
- Second pass: Large group support (TBD)
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