SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Literal \'second\'
    Function dateDiff (children 1)
     ExpressionList (children 3)
      Literal \'second\'
      Function toDate32 (children 1)
       ExpressionList (children 1)
        Literal \'1969-12-31\'
      Function toDate32 (children 1)
       ExpressionList (children 1)
        Literal \'1970-01-01\'
