[BUG]: transform dataset failed to create a new column

[dgauldie]

• Scenario: transform-dataset
• Step: 3.7
• Link to the project: https://app.staging.terarium.ai/projects/d14dbe2e-48c4-4ddf-af82-064983a46de8/workflow/d35e4cb3-6be5-4ea1-b814-f0ccd2078a09?operator=9aadc0d8-1025-4d46-a2dc-9dcb3164c690

Describe the issue
When trying to ask beaker to add a new column named timestamp that is a timestamp representation of the date column, the following error occured.

/tmp/ipykernel_23706/1580995843.py:1: SettingWithCopyWarning: 
A value is trying to be set on a copy of a slice from a DataFrame.
Try using .loc[row_indexer,col_indexer] = value instead

See the caveats in the documentation: https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy
  filtered_df['timestamp'] = pd.to_datetime(filtered_df['date'])