SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function CAST (children 1)
     ExpressionList (children 2)
      Function replicate (children 1)
       ExpressionList (children 2)
        Literal Array_[\'a\']
        Literal Array_[UInt64_1]
      Literal \'String\'