Which M Functions Are Only Available To Custom Data Connectors?

Here’s one for all you M geeks out there. If you look at the example code for custom data connectors on the Power BI custom data connectors GitHub repo it’s clear that there are several M functions that are available in custom data connectors that aren’t available in Power BI Desktop. But what are they? As I’m sure you know, you can get a list of all the functions, types and enums available in M using the #shared keyword. Well, I created a simple custom data connector that calls #shared and returned a table of all the functions, types and enums available to a custom data connector, and then compared that table with what #shared returns when you run it in Power BI Desktop. This made it easy to find a list of M functions, types and enums that are only available in custom data connectors, and here are all 34:

  • CryptoAlgorithm.Type
  • CryptoAlgorithm.SHA1
  • CryptoAlgorithm.SHA256
  • Crypto.CreateHmac
  • Crypto.CreateHash
  • Web.SignForOAuth1
  • OAuth1.Type
  • OAuth1.HMACSHA1
  • OAuth1.RSASHA1
  • Extension.Module
  • Extension.CurrentCredential
  • Extension.CurrentApplication
  • Extension.CredentialError
  • Extension.LoadString
  • Extension.Contents
  • Credential.AccessDenied
  • Credential.AccessForbidden
  • Credential.EncryptionNotSupported
  • Credential.NativeQueryPermission
  • Error.Unexpected
  • Uri.Type
  • Binary.End
  • Action.Type
  • Action.Sequence
  • Action.Return
  • Action.Try
  • Action.DoNothing
  • ValueAction.Replace
  • ValueAction.NativeStatement
  • TableAction.InsertRows
  • TableAction.UpdateRows
  • TableAction.DeleteRows
  • WebAction.Request
  • Delta.Since

Some of these, like the Action functions, are documented in the Power Query function reference, and as I said others are mentioned in the Power BI custom data connectors GitHub repo, but there’s definitely some detective work to do here…

8 thoughts on “Which M Functions Are Only Available To Custom Data Connectors?

      • I’m actually quite keen on hunting different versions of PowerQuery from all over. For example Azure Analysis Services has a couple more functions exposed through their #shared construct, although not sure if we can use them. DataConnectors SDK also has some functions that don’t make it through.

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