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drop function if exists cascade_rounding(float[]); create or replace function cascade_rounding(float[]) returns int[] immutable language plpgsql as $$ declare fp_total float = 0; int_total int = 0; fp_value float; int_value int; result int[]; begin foreach fp_value in array $1 loop int_value := round(fp_value + fp_total) - int_total; fp_total := fp_total + fp_value; int_total := int_total + int_value; result := result || int_value; end loop; return result; end $$;
select cascade_rounding(array[1.1, 1.2, 1.4, 1.2, 1.3, 1.4, 1.4])
cascade_rounding
{1,1,2,1,1,2,1}