Fixes flaky test test_datetime_split[dask] #2232
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Fixes #2227
If we assign the date column
df["date_col"] = df["C"].map(random_date)after converting df to a dask dataframe, then the map gets lazy evaluated which gives a new set of random dates each time we access it.Fixed by assigning df["date_col"] to the pandas dataframe before converting to dask.