But they do sort of acknowledge it in the paper. Eg on the first page it says:
> …we present a solution – adding pipe-structured data flow syntax to SQL. This makes SQL more flexible, extensible and easy to use. This paradigm works well in other languages like Kusto’s KQL[5]
Strange typo though, to say “Kusto’s KQL” instead of “Microsoft’s KQL”
Kusto is allegedly named after (sort of in reference to) Jacques Cousteau, so “Kusto’s” doesn’t make sense.