SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function tokens (children 1)
     ExpressionList (children 3)
      Literal \'a\'
      Literal \'splitByString\'
      Function toFixedString (children 1)
       ExpressionList (children 2)
        Literal \'c\'
        Literal UInt64_1
