SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 4)
    Function toWeek (children 1)
     ExpressionList (children 1)
      Function toDate (children 1)
       ExpressionList (children 1)
        Literal \'1998-12-31\'
    Function toWeek (children 1)
     ExpressionList (children 1)
      Function toDate (children 1)
       ExpressionList (children 1)
        Literal \'1997-12-31\'
    Function toWeek (children 1)
     ExpressionList (children 2)
      Function toDate (children 1)
       ExpressionList (children 1)
        Literal \'1998-12-31\'
      Literal UInt64_1
    Function toWeek (children 1)
     ExpressionList (children 2)
      Function toDate (children 1)
       ExpressionList (children 1)
        Literal \'1997-12-31\'
      Literal UInt64_1