CREATE TABLE a (
id INTEGER PRIMARY KEY,
arr VARCHAR(150)[] NULL
);
INSERT INTO a (id, arr) VALUES (1, ARRAY['1a','3','2']);
INSERT INTO a (id, arr) VALUES (2, ARRAY[1,1,1]);
INSERT INTO a (id, arr) VALUES (3, '{123,123,abc,1a}');
SELECT UNNEST(arr) FROM a WHERE arr::text like '1%';