SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 4)
    Function toFixedString (alias original) (children 1)
     ExpressionList (children 2)
      Literal \'https://clickhouse.com\'
      Literal UInt64_22
    Function base64URLEncode (alias encoded) (children 1)
     ExpressionList (children 1)
      Identifier original
    Function base64URLDecode (children 1)
     ExpressionList (children 1)
      Identifier encoded
    Function tryBase64URLDecode (children 1)
     ExpressionList (children 1)
      Identifier encoded
