Tests of "impure" aggregates.  These are cases where an aggregate expression refers to a grouping column:
Tests of "impure" aggregates.  These are cases where an aggregate expression refers to a grouping column:

X = [FROM Emp EMIT Emp.dept_id, SUM(Emp.salary) + Emp.dept_id];

Here, the reference to dept_id in the second column is "impure".

uwescience/raco,uwescience/raco,uwescience/raco,uwescience/raco,uwescience/raco