Postgres array column accidentally made to text, how can I convert it back to a text array?

Question

There's a column in my database that's a text column that should be an array column. All of the values of that column are valid Postgres arrays (since they were taken as text values from a Postgres array column) with format like {valuea,valueb} . I need them as array values however, so how do I convert them back to array values?

Answer 1

You may use ALTER TABLE.. ALTER COLUMN with the USING option

alter table t alter column col type text[] using col::text[];

Demo