select date_add('2021-01-01',interval @i:=@i+1 day) as date
from ( select 1 union all select 1 union all select 1 union all select 1) as tmp,
(select @i:= -1) t
select date_add('2021-01-01',interval @i:=@i+1 day) as date
from ( select 1 union all select 1 union all select 1 union all select 1) as tmp,
(select @i:= -1) t
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