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.
-----Original Message----- From: Brian Long [mailto:br...@dotspots.com] Sent: Friday, May 22, 2009 3:38 PM To: pig-dev@hadoop.apache.org Subject: UDF with parameters? Hi, 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 see any way to do that, and it seems like I might need to create PERCENTILE_50, PERCENTILE_90, etc type UDFs explicitly, versus being able to do something like GENERATE PERCENTILE(90, duration) I'm new to Pig, so I might be missing the way to do this... is it possible? Thanks, Brian
