You should be able to send the percentile rank that you want to
calculate as a udf argument like the way you stated - generate
Percentile(90, duration) - here 90 will be an integer constant sent as
the first argument to your udf.
From: Brian Long [mailto:br...@dotspots.com]
Sent: Friday, May 22, 2009 3:38 PM
Subject: UDF with parameters?
I'm interested in developing a PERCENTILE UDF, e.g. for calculating a
median, 99th percentile, 90th percentile, etc. I'd like the UDF to be
parametric with respect to the percentile being requested, but I don't
any way to do that, and it seems like I might need to create
PERCENTILE_90, etc type UDFs explicitly, versus being able to do
like GENERATE PERCENTILE(90, duration)
I'm new to Pig, so I might be missing the way to do this... is it