Hi, I have a quick question regarding aggregation.
First, let me explain my understanding. I see two types of aggregation. First is at the column level. Like, AVG(age) on a table. It will, on the server side, for each region, sum the age, and divide by the number of rows. Fine. Second is at the cell level. Imagine I want a counter. I do multiple puts for the exact same cell. At compaction time, or at read time, there will be an aggregation that will return only the sum of all those cells. AggregateImplementation is an implementation of the first case. It runs as a coprocessor EndPoint. Do we have an implementation of the 2nd one? There can be many different implementations. For counters, were we just put what ever and get an incremental number. For accumulator, where we put numbers and get the sum of all the numbers we have put. For average, where we put numbers and get the average of all the puts (cell will store something like "sum|count"). etc. I looked at the existing coprocessors and I don't see anything like that. Before starting to implement my own, I'm wondering if there is already an existing solution. Thanks, JMS
