SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function toWeek (children 1)
     ExpressionList (children 2)
      Function toDate (children 1)
       ExpressionList (children 1)
        Literal \'2000-12-31\'
      Literal UInt64_2
    Function toWeek (children 1)
     ExpressionList (children 2)
      Function toDate (children 1)
       ExpressionList (children 1)
        Literal \'2000-12-31\'
      Literal UInt64_3