I can see the following columns, which are not described in this article, when I select from sys.external_data_sources:
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@sidesw1pe -- thank you for your feedback.
@stevestein -- please look into this issue #4170.
Apologies for the delayed response. @CarlRabeler Could you please look into this issue? Thank you! #reassign:CarlRabeler
@pmasl Pedro, could you please look at this issue re: missing columns? Thanks, Carl
uc-msft is already assigned.
@uc-msft Could you add descriptions for these columns here and I can help get it into the docs. #assign:rothja
Also @mihaelablendea in case she has context
@mihaelablendea @uc-msft Please take a look at this older git issue. @sidesw1pe has pointed out that the table sys.external_data_sources does not have documentation for two columns:
I verified these columns exist on SQL Server 2019:

If you can provide some descriptions, I can help add them to the article.
Mihaela, I'm adding you to the issue along with UC and me. #assign:mihaelablendea
@mihaelablendea @uc-msft Let me know if you have a chance to take a look at this. Thank you!
Tracking in User Story 1799704: PolyBase | Git Issue - Describe new columns in sys.external_data_sources