Wait for the result to be available and fetch the result from a previous assignment or aggregation operation that may have been run asynchronously, in which case it is a one-shot call. When the assignment or aggregation operation was not asynchronous, the result is wrapped in the object and can be fetched multiple times.
Arguments
- res
An object inheriting from
DSResult-class.
See also
Other DSResult generics:
DSResult-class,
dsGetInfo(),
dsIsCompleted()
Examples
if (FALSE) { # \dontrun{
con <- dsConnect(DSOpal::Opal(), "server1",
username = "dsuser", password = "password", url = "https://opal-demo.obiba.org")
dsAssignExpr(con, "C", as.symbol("c(1, 2, 3)"))
res <- dsAggregate(con, as.symbol("length(C)"))
length <- dsFetch(res)
dsDisconnect(con)
} # }