I would like to ask if there is any way to make an aggregate function to take a set of tuples as an input variable. I know that an actual aggregate function receives each tuple one at a time and process it on the fly. However I want to store tuples in an incremental fashion so as to process them in a batch approach in the finalaggr function. Think for example implementing logistic regression (which is an OLAP query by its nature). I want to support it with the current features that PostgreSQL provides from which the closest feature is an aggregate. However an aggregate function feeds me one a tuple for each call, but I would like to have access to a batch of tuples per function call. Is there any possible way to perform something like this?
Thank you very much for your time,
Michael
