WORKAROUND:
If possible, write the query as follows:
select count(*) as number,'hpn_excellus_ancillary_empire' as
table_name from
pub_ehp.hpn_excellus_ancillary_exchange_data_empire_hv
union all
select count(*) as number,'hpn_excellus_ancillary' as table_name
from pub_ehp.hpn_excellus_ancillary_exchange_data_hv
union all
select count(*) as number,'hpn_univera_ancillary' as table_name
from pub_ehp.hpn_univera_ancillary_exchange_data_hv
STATUS:
Issue fixed in version 5.0. The latest version of Toad Data Point can be downloaded at: https://support.quest.com/download-product-select