SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function ngrams (children 1)
     ExpressionList (children 2)
      Function materialize (children 1)
       ExpressionList (children 1)
        Function toFixedString (children 1)
         ExpressionList (children 2)
          Literal \'Test\'
          Literal UInt64_4
      Literal UInt64_4