Hi Nitin Thanks Yes I did actually do a nested query but it spawns reducers that I did not want…I wanted to keep it to one select so that only mappers are called and then I can invoke several mappers to call the we b service
Thanks sanjay From: Nitin Pawar <nitinpawar...@gmail.com<mailto:nitinpawar...@gmail.com>> Reply-To: "user@hive.apache.org<mailto:user@hive.apache.org>" <user@hive.apache.org<mailto:user@hive.apache.org>> Date: Tuesday, July 23, 2013 12:25 PM To: "user@hive.apache.org<mailto:user@hive.apache.org>" <user@hive.apache.org<mailto:user@hive.apache.org>> Subject: Re: Calling same UDF multiple times in a SELECT query fucntion return values are not stored for repeat use of same (as per my understanding) I know you may have already thought about other approach as select a , if (call <-1, -1 call) as b from (select a, fooudf(a) as call from table On Wed, Jul 24, 2013 at 12:42 AM, Sanjay Subramanian <sanjay.subraman...@wizecommerce.com<mailto:sanjay.subraman...@wizecommerce.com>> wrote: 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. -- Nitin Pawar 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.
