Calling same UDF multiple times in a SELECT query

[Sanjay Subramanian]

Hi

V r using version hive-exec-0.9.0-cdh4.1.2 in production

I need to check and use the output from a UDF in a query to assign values to 2 
columns in a SELECT query

Example

SELECT
     a,
     IF(fooUdf(a) < -1  , -1, fooUdf(a)) as b,
     IF(fooUdf(a) < -1  , fooUdf(a), 0) as c
FROM
     my_hive_table


So will fooUdf be called 4 times ? Or once ?

Why this is important is because in our case this UDF calls a web service and I 
don't want so many calls to the service.

Thanks

sanjay



CONFIDENTIALITY NOTICE
======================
This email message and any attachments are for the exclusive use of the 
intended recipient(s) and may contain confidential and privileged information. 
Any unauthorized review, use, disclosure or distribution is prohibited. If you 
are not the intended recipient, please contact the sender by reply email and 
destroy all copies of the original message along with any attachments, from 
your computer system. If you are the intended recipient, please be advised that 
the content of this message is subject to access, review and disclosure by the 
sender's Email System Administrator.