SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function tokens (children 1)
     ExpressionList (children 3)
      Literal \'a\'
      Literal \'splitByString\'
      Function materialize (children 1)
       ExpressionList (children 1)
        Literal Array_[\'c\']
