Tom-Newton commented on code in PR #45021:
URL: https://github.com/apache/arrow/pull/45021#discussion_r1885669198


##########
cpp/src/arrow/filesystem/azurefs.cc:
##########
@@ -148,8 +148,10 @@ Status AzureOptions::ExtractFromUriQuery(const Uri& uri) {
       ARROW_ASSIGN_OR_RAISE(background_writes,
                             ::arrow::internal::ParseBoolean(kv.second));
     } else {
-      return Status::Invalid(
-          "Unexpected query parameter in Azure Blob File System URI: '", 
kv.first, "'");
+      // Assume these are part of a SAS token. Its not ideal to make such an 
assumption
+      // but given that a SAS token is a complex set of URI parameters, that 
could be
+      // tricky to exhaustively list I think its the best option.
+      credential_kind = CredentialKind::kSasToken;

Review Comment:
   I think that doc is only for user delegated SAS tokens so I unioned it with 
the parameters for account and service SAS tokens and hopefully the spec is 
slowly changing. 
   
   I wasn't really confident on the best way to define a constant set of 
strings to do `contains` checks against in C++. Since there are only 27 values, 
I ended up with a `constexpr` array and `std::find` but please let me know if 
this is not a good option.



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