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CREATE FUNCTION fun_cast(anycompatiblearray, anyrange) RETURNS anymultirange AS $$ SELECT range_agg(t.x) FROM (SELECT unnest($1) x) t; $$ LANGUAGE SQL IMMUTABLE PARALLEL SAFE; WITH i AS ( SELECT ARRAY[ daterange('2023-01-01', '2023-02-01'), daterange('2023-05-01', '2023-09-01') ]::daterange[] x ) SELECT fun_cast(i.x, i.x[0]) from i;

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