SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function minus (children 1)
     ExpressionList (children 2)
      Function greatest (children 1)
       ExpressionList (children 2)
        Function now (children 1)
         ExpressionList
        Function plus (children 1)
         ExpressionList (children 2)
          Function now (children 1)
           ExpressionList
          Literal UInt64_10
      Function now (children 1)
       ExpressionList