groupby.Transform Aggregation into Collections returns individual elements (unless added or string concatenated) #18084
Labels
Apply
Apply, Aggregate, Transform
Bug
Groupby
Nested Data
Data where the values are collections (lists, sets, dicts, objects, etc.).
When attempting to transform (pd.groupby.transform) into collections in pandas, the like NDFrame object returns the individual elements instead of a collection. string to literal evaluation workaround must be implemented. This functions normally with custom aggregation (groupby.agg) - but does not work correctly with groupby.transform.
Regards,
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