select count(distinct(origin_from_address)) as swappers,
count(distinct(tx_hash)) as swaps,
'before Nitro' as type
from arbitrum.core.fact_event_logs
where event_name = 'Swap'
and block_timestamp >= '2022-08-26' and block_timestamp < '2022-08-31'
group by 3
UNION
select count(distinct(origin_from_address)) as swappers,
count(distinct(tx_hash)) as swaps,
'after Nitro' as type
from arbitrum.core.fact_event_logs
where event_name = 'Swap'
and block_timestamp > '2022-08-31'
group by 3