CreateQuery test_cume_dist (children 3)
 Identifier test_cume_dist
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration a (children 1)
    DataType Int
   ColumnDeclaration b (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType Int
 Storage definition (children 1)
  Function Memory
