Hi users! Given my Cassandra version 3.0.x I don't have the famous GROUP BY operator available. So looking around I turned to UDAs.
I'm aware all/most of the magic happens on the coordinator and the plan is to keep the data volume low to avoid too much pressure. Q1: How much is low volume. It's obvious the answer is depends but, has anyone some experience to share? Q2: Do I undestand correctly is does not support pagination? I need something as simple as extract `min`, `max`, `average` and `count` per group where I don't know the actual group - I can't fire a query per each group name. - so something like `SELECT my_uda(field1, field2) WHERE ...;` This leads to: - a function that tracks min, max and sum up count and average. The state is a tuple - a final function that computes the average. - the aggregate function that uses the previous two the result is something like | 'item': (min_value, max_value, avg_value, count) , 'item2': (...), ...| Q3: Is there a way to `flatten` or `explode` the result into multiple lines ? If Q3 answer is yes: Is there a way to create multiple columns out of the result: ||other_fileds | item | min | max | avg | count|| BONUS: Are there altenative? Should I really take into account upgrading to 3.11.X ? Thanks!
