Class SelectExpression

java.lang.Object
org.yamcs.yarch.streamsql.SelectExpression

public class SelectExpression extends Object
Corresponds to a queries like "select 2*x, x+sum(y+3) from t[...] where x>5 group by x" chain of data/processing (D=Data, P=Processing, agg=aggregate):
 (D1)   inputDef             (x,y)
 
 (P1.1) where filter         (x>5)
 (P1.2) aggInputList
 
 (D2)   aggInputDef          (x,y+3)
 
 (P2)   aggSelectList

 (D3)   aggOutputDef         (x,sum(y+3))
 
 (P3)   selectList
 
 (D4)   outputDef            (2*x,x+sum(y+3))
 
P1.2 is performed by the WindowProcessor If there is no aggregate, then P3 follows directly after P1.1