SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function tokens (children 1)
     ExpressionList (children 3)
      Literal \'a\'
      Literal \'ngrams\'
      Function toInt8 (children 1)
       ExpressionList (children 1)
        Literal Int64_-1
