I just through a derivative of collectset called collect but we need some type of string join that takes an array and a delimiter.
https://github.com/edwardcapriolo/hive-collect On Fri, May 11, 2012 at 4:05 PM, Edward Capriolo <edlinuxg...@gmail.com> wrote: > The main issue with group_concat is that aggregates have to keep each > column in memory and that is a big problem. If The user knows the list > will be small you could write a UDAF like collectset, collect which > puts each value into a list and then you can lateral view that list. > > Edward > > On Fri, May 11, 2012 at 4:02 PM, Saurabh S <saurab...@live.com> wrote: >> >> As far as I understand, there is no equivalent of MySQL group_concat() in >> Hive. This stackoverflow question is from Sept 2010: >> http://stackoverflow.com/questions/3703740/combine-multiple-rows-into-one-space-separated-string >> >> Does anyone know any other method to create a delimited list from from table >> rows? There are a few methods listed in Anthony Molinaro's SQL Cookbook, but >> all of them use over(partition by) method which is also not available in >> Hive. >>
