Attached is PoC v2, which fully replaces the hash table with radix
tree and passes regression tests.
The architecture is still one of tidbitmap.c having it's own tree of
(fixed length) PagetableEntries. The eventual goal is for vacuum and
tidbitmap to both use TID store in some form, but there are
This is not in reviewable state, but I wanted to get a sketch of a PoC
out there and highlight some issues that will need to be tackled. The
index scan successfully populates the radix tree and the contents are
verified to match the hash table for the queries present in the
regression tests. (Now t
