HIVE:GROUP BY Key 错误

HIVE: Error in GROUP BY Key

hive -e "select a.EMP_ID,
       count(distinct c.SERIAL_NBR) as NUM_CURRENT_EMP,
       count(distinct c.SERIAL_NBR)/count(distinct a.SERIAL_NBR) as DISTINCT_EMP
from   ORDERS_COMBINED_EMPLOYEES as a
inner  join ORDERS_EMPLOYEE_STATS as b
         on a.CPP_ID = b.CPP_ID
left   join (   select SERIAL_NBR, MIN(TRAN_DT) as TRAN_DT
                from   EMP_TXNS
                group  by SERIAL_NBR
            ) c
         on c.SERIAL_NBR = a.SERIAL_NBR
where    c.TRAN_DT > a.LAST_TXN_DT
group by a.EMP_ID
having ( 
          (NUM_CURRENT_EMP >= 25 and DISTINCT_EMP > 0.01)
       ) ; " > EMPLOYEE_ORDERS.txt

收到错误消息,
"FAILED: SemanticException [Error 10025]: Line 15:31 Expression not in GROUP BY key '0.01'".
当我 运行 与 HAVING 子句中只有一个条件的相同查询与 NUM_CURRENT_EMP >= 25 相同时,查询 运行 没有任何问题。 NUM_CURRENT_EMPint 类型,DISTINCT_EMPfloat 在 table 我试图插入结果的地方。打破我的头。
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如果将 having 中的别名替换为定义别名的表达式会怎样?

having count(distinct c.SERIAL_NBR) >= 25 and
       count(distinct c.SERIAL_NBR)/count(distinct a.SERIAL_NBR) > 0.01