I'm using the embedded SQL in C to create the User-Defined Aggregate(UDA). The command is : CREATE AGGREGATE aggname( sfunc=kmeans, stype=double precision[], finalfunc=kmeansfinal, INITCOND='{1,2,3}');
Since I need to do the aggregation in multiple rounds. I need to initialize the INITCOND using the execution result of last execution （aggregation.） Any one can tell me how can I initialize the INITCOND using host variables instead of hard code the INITCOND?
The reason why I need to do this is that I am implementing the K-Means Clustering algorithm which is a recursive algorithm. Now my idea of doing this is I get the result from one round aggregation, DROP the AGGREGATE, and CREATE a new AGGREGATE using the result of last round.