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create or replace aggregate array_agg_mult(anycompatiblearray) ( sfunc = array_cat, stype = anycompatiblearray, initcond = '{}' );
CREATE AGGREGATE
SELECT array_agg_mult(i) FROM (VALUES (ARRAY[row(1,2),row(3,4)]), (ARRAY[row(5,6),row(7,8)])) as t(i);
array_agg_mult
{"(1,2)","(3,4)","(5,6)","(7,8)"}
SELECT 1