From the following errors in the Vertica logs, we can see that the problem is caused by the existence of duplicates in the poll_item table;
Caused by: java.sql.SQLIntegrityConstraintViolationException: [Vertica][VJDBC](3149) ERROR: Duplicate primary/unique key detected in join [(dauser.avail_rate x dauser.poll_item) using avail_rate_super_seg_b0 and poll_item_is_filtered_in_order_by_node0001 (PATH ID: 21)]; value [2343921]
These duplicates need to be deleted as they're causing conflict issues when NetOps Portal queries the DB.