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Inconsistent return type when grouping dates by frequency with custom reduction function #11742
If I group a
Grouping without resampling dates returns a
If I apply a frequency in the
Since in this example, assigning dates to months still leaves the same groups, I would have expected identical results whether I set
I guess. this is a quite tricky code path. Welcome for you to take a stab at making them consistent.
Keeping in mind that
You should avoid custom functions this as they are non-performant anyhow.