Avoid infinite match in OlapProjectMergeRule caused by simplify projects

SELECT (CASE WHEN "t2"."__measure__2" = 0 THEN NULL ELSE CAST("t0"."__measure__0" AS DOUBLE PRECISION) / "t2"."__measure__2" END) AS "TEMP(Test)(3502400386)(0)"
FROM (
  SELECT SUM("CALCS"."NUM1") AS "__measure__0"
  FROM "TDVT"."CALCS" "CALCS"
  HAVING (COUNT(1) > 0)
) "t0"
  CROSS JOIN (
  SELECT AVG("t1"."__measure__0") AS "__measure__2"
  FROM (
    SELECT SUM("CALCS"."NUM1") AS "__measure__0"
    FROM "TDVT"."CALCS" "CALCS"
    GROUP BY "CALCS"."STR1"
  ) "t1"
  HAVING (COUNT(1) > 0)
) "t2"
LIMIT 500