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If we do not specify individual variables to assign to the server-side R session, like in this case, all variables held in the Opal servers are assigned. You can add an argument ("variables") to datashield.assign.table which will limit the columns which will be loaded from the server data frame (for usage see the help materials for the function: ?datashield.assign.table ).

Assigned data are kept in a data frame named DST by convention. Each column of that data frame represents one variable and the rows are the individual records.