Fellow hacker,

I am new comer to postgres development community. Currently, I am implementing tightly coupled machine classifiers within postgres. The grammer looks like Train Parameter_list (class1,class2,class3...). I have two major problems right now.

1. Train is a statement and it is suppose to return some parameters in the form of a query. (To be used by a classifier later.) How can I return a Query with self specified column name and data vectors?

2. class1, class2 are all supposed to be relations/query result. But what is a proper container to hold them. I found var_list to be a good candidate as it can contain unconstrained number of var_values. But var_values are of constant types. Can I just add query as a constant? Anyone had this kind of implementing experience?

Thanks,
John
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