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是否可以將UDF嵌套在一起？UDF的紅移：可能引用另一個UDF
以下是用於計算A/B測試中置信區間的代碼 - Ofcourse，我可以編寫一個功能齊全的巨大函數，但想知道實現此目標的更好方法嗎？
set search_path to public;
create function cumnormdist(x float)
returns float
IMMUTABLE AS $$
import math
b1 = 0.319381530
b2 = -0.356563782
b3 = 1.781477937
b4 = -1.821255978
b5 = 1.330274429
p = 0.2316419
c = 0.39894228
h=math.exp(-x * x/2.0)
if(x >= 0.0) :
t = 1.0/(1.0 + p * x)
return (1.0 - c * h * t *(t *(t * (t * (t * b5 + b4) + b3) + b2) + b1))
else :
t = 1.0/(1.0 - p * x);
return (c * h * t *(t *(t * (t * (t * b5 + b4) + b3) + b2) + b1))
$$ language plpythonu;
set search_path to public;
create or replace function conversion(experience_total float,experience_conversions float)
returns float
IMMUTABLE AS $$
return experience_conversions*1.0/experience_total
$$ language plpythonu;
create or replace function zscore(total_c float,conversions_c float,total_t float,conversions_t float)
returns float
IMMUTABLE AS $$
import math
z = conversion(total_t,conversions_t)-conversion(total_c,conversions_c) # Difference in means
s =(conversion(total_t,conversions_t)*(1-conversion(total_t,conversions_t)))/total_t+(conversion(total_c,conversions_c)*(1-conversion(total_c,conversions_c)))/total_c
return float(z)/float(math.sqrt(s))
$$ language plpythonu;
create or replace function confidence(total_c float,conversions_c float,total_t float,conversions_t float)
returns float
IMMUTABLE AS $$
import math
return **(1-float(cumnormdist(zscore(total_c float,conversions_c float,total_t float,conversions_t float)),4))*100.00**
$$ language plpythonu;
的每個來電做工精細，如：select cumnormdist (-3.1641397476);如果我在函數定義插入他們，他們不，用於調用轉換功能例如zscore。
ERROR: NameError: global name 'zscore' is not defined. Please look at svl_udf_log for more information
DETAIL:
-----------------------------------------------
error: NameError: global name 'zscore' is not defined. Please look at svl_udf_log for more information
code: 10000
context: UDF
query: 0
location: udf_client.cpp:298
process: padbmaster [pid=3585]
-----------------------------------------------
如果我可以嵌套函數彼此內部，（而不是具有UDF如上是最終嵌套的），這將是一個合理的維持現狀。
最終目標：在Tableau中發佈這些計算。