Get column name from a variable in snowflake

How to get a column name from a variable?

I was trying this but did not work

set a = 'aaa';
select 1 as $a ;

I suspect what you're really after is a way to select a specific column by assigning that column name to a variable.

create or replace temporary table t (col1 varchar); --example table

set col_name = 'col1'; --assign column name to a variable

select identifier($col_name) --reference it using identifier()
from t;