我有两个功能。第二个函数使用第一个函数的输出。
一是：

DELIMITER $$
DROP FUNCTION IF EXISTS fp_splitfactor;
CREATE FUNCTION fp_splitfactor_price (id CHAR(8), startdate DATE)
RETURNS FLOAT
BEGIN
DECLARE splitfactor FLOAT;
SELECT IFNULL(EXP(SUM(LOG(f.p_split_factor))),1) INTO splitfactor
FROM fp_v2_fp_basic_splits AS f
WHERE f.fsym_id = id AND f.p_split_date > startdate AND f.p_split_date < NOW();
RETURN splitfactor; 
END$$
DELIMiTER ;

第二个是：

DELIMITER $$
DROP FUNCTION IF EXISTS fp_splitadjprice;
CREATE FUNCTION fp_splitadjprice (id CHAR(8), startdate DATE)
RETURNS FLOAT 
BEGIN
DECLARE splitfactor FLOAT;
DECLARE splitadjprice FLOAT;
DECLARE spinofffactor FLOAT;
SET splitfactor = 1.0;
SELECT fp_splitfactor(id, startdate) INTO splitfactor;
SELECT (p_price * splitfactor) INTO splitadjprice
FROM fp_v2_fp_basic_prices
WHERE fsym_id = id AND p_date = startdate;
RETURN splitadjprice;
END$$
DELIMITER ;

然后，我尝试执行一个查询，如下所示：

SELECT 
p.fsym_id, 
b.p_co_sec_name_desc AS Company_Name,
b.region AS Region,
p.p_date,
p.p_price AS Unadjusted_Price,
fp_splitadjprice(p.fsym_id,p_date) AS Adjusted_Price
FROM
fp_v2_fp_basic_prices p
LEFT JOIN (
        SELECT r2.region, b2.p_co_sec_name_desc, b2.fsym_id
        FROM  fp_v2_fp_sec_coverage b2
        LEFT JOIN sym_v1_sym_region r2 ON b2.fsym_id = r2.fsym_id
        WHERE r2.region = "EUR") b
        ON b.fsym_id =p.fsym_id

所以基本上我的查询调用第二个函数，然后调用第一个函数，以便向查询返回一个值。虽然执行非常缓慢，但我不明白为什么会这样？