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CREATE FUNCTION test(daterange[]) RETURNS datemultirange LANGUAGE SQL IMMUTABLE PARALLEL SAFE RETURN (SELECT range_agg(t.x) FROM (SELECT unnest($1) x) t); WITH i AS ( SELECT ARRAY[ daterange('2023-01-01', '2023-02-01'), daterange('2023-05-01', '2023-09-01') ]::daterange[] x ) SELECT test(i.x) from i;

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