def from_sql(db, query)
        require 'daru/io/sql_data_source'
        SqlDataSource.make_dataframe(db, query)
      end
Execute a query and create a data frame from the result

@param db [DBI::DatabaseHandle, String] A DBI connection OR Path to a SQlite3 database.
@param query [String] The query to be executed

@return A dataframe containing the data resulting from the query