Home | About | Sematext search-lucene.com search-hadoop.com
 Search Hadoop and all its subprojects:

Switch to Threaded View
Hive >> mail # user >> Calling same UDF multiple times in a SELECT query


Copy link to this message
-
Calling same UDF multiple times in a SELECT query
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.