IS there a reason why I wouldn’t have custom column as an option when asking a custom question?
Hi @watthell234
Yes, if the database you’re using doesn’t currently support it.
I’m taking a stab in the dark and guessing you’re using BigQuery?
https://github.com/metabase/metabase/issues/9382 - upvote by clicking 
on the first post
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It is Bigquery. Thanks!