1402 CG0546 support multi-key param update #1429
Merged
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#1402: Updated
target_is_sorted_byto normalize thewithinparameter to an ordered list, then reuse the existing sort-and-group flow so it handles one or many grouping keys without materializing the entire dataset. Adjusted the post-group alignment to drop levels only when the grouped result is multi-indexed, keeping Pandas and Dask behavior in sync. Extended the operator schema and reference guide to document the list form, and added positive/negative multi-key tests for both PandasDataset and DaskDataset to cover the regression that affected rule CG0546.