Avoid pandas' SettingWithCopyWarning #5105
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When running
etf/searchthe user is met with a pandas warningApparently even if we use the pattern the warning proposes pandas still can't figure out if the operation is made on the original df or a copy. My current understanding is that this happens because the df is passed into the function.
This PR creates a copy of the dataframe that we will manipulate explicitly so that pandas doesn't have to guess