HIVE小问题随记

HIVE:
select FLOAT(0.3)//0.30000001192092896
JAVA:
        public void floatTest(){
            float a = 0.3f;
            //float :0.30000001192092896000
            System.out.printf("float :%.20f\n",a);
            //double :0.30000000000000000000
            System.out.printf("double :%.20f\n",0.3);
            //字面量0.3，默认为double类型，比较时把float类型转变为double类型，float后面补0，因此float 0.3>double 0.3
            System.out.println("float>double:"+(a>0.3));
    }