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CREATE FUNCTION runs(input int[], output int[] DEFAULT '{}') RETURNS int[] AS $$ SELECT CASE WHEN cardinality(input) = 0 THEN output ELSE runs(input[2:], array_append(output, CASE WHEN input[1] = 0 THEN 0 ELSE output[cardinality(output)] + input[1] END) ) END $$ LANGUAGE SQL; select runs('{0,1,1,1,1,0,-1,-1,-1,0}');
runs
{0,1,2,3,4,5,6,0,0,0,-1,-2,-3,-4,-5,0}
CREATE OR REPLACE FUNCTION runs(input int[], output int[] DEFAULT '{}') RETURNS int[] AS $$ SELECT; SELECT CASE WHEN cardinality(input) = 0 THEN output ELSE runs(input[2:], array_append(output, CASE WHEN input[1] = 0 THEN 0 ELSE output[cardinality(output)] + input[1] END) ) END $$ LANGUAGE SQL; select runs('{0,1,1,1,1,0,-1,-1,-1,0}');
runs
{0,1,2,3,4,0,-1,-2,-3,0}