At https://datastax.github.io/java-driver/manual/async/ the docs say to not
do any blocking operations within the callback of an async operation. This
example is given as one that can cause a deadlock:

ListenableFuture<ResultSet> resultSet = Futures.transform(session,
    new Function<Session, ResultSet>() {
        public ResultSet apply(Session session) {
            // Synchronous operation in a callback.
            // DON'T DO THIS! It might deadlock.
            return session.execute("select release_version from
system.local");
        }
    });

Will the above example work if instead of session.execute, it was doing
session.executeAsync()?

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