The AddColumnsStream, SortStream, and requisite yacc/lex grammar were
originally added to a new branch, off of development, which is on net8.
I forgot to change it to net7 when I cherry-picked the commits for the
regular development branch.
It's wasn't quite as simple as flipping net8 -> net7 in csproj files,
because I was eager to use new language features only available in net8!
Namely, primary constructors and collection expressions.
Taha