scala spark 高精度BigDecimal除法
scala 除法val totalnumBigDecimal = new java.math.BigDecimal(totalnum)val reissuenumBigDecimal = new java.math.BigDecimal(reissuenum)val reissuerate = reissuenumBigDecimal.divide(totalnumBigDecimal, 2, java.math.BigDecimal.ROUND_HALF_DOWN).doubleValue()
