That thread is talking about the possible inclusion of our indexing library inside Postgres, and was from before we had open sourced the code. IANAL but I thin

That thread is talking about the possible inclusion of our indexing library inside Postgres, and was from before we had open sourced the code. IANAL but I think it would be possible to include the fractal tree library in Postgres now if someone wanted to do it, but none of it has ever been implemented by Postgres.