HPCC-8512 Ensure all set results are tagged as root - not just the first

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Merge pull request #3821 from ghalliday/issue8512

HPCC-8512 Ensure all set results are tagged as root - not just the first

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>