YQL-20631: Support RECURSIVE WITH CTE on YqlSelect

Implemented a RECURSIVE WITH CTE translation for YqlSelect. It relies on YqlSelf callable.
As this callable binds to enclosing YqlSelect, the diagnostic that subquery can't reference
an enclosing RECURSIVE WITH CTE was added, it is better, that an existing for pgSQL, where
just "table not found" is emitted. The core idea under RECURSIVE handling is that a
"not ready" CTE entry is added to a namespace (with a `nullptr` node), so it can be recognized.
Checked some interesting test cases and wrote TODOs.
commit_hash:65b8646e0615ae070b04822ce7af24245c203bbe

0 files changed, 0 insertions, 0 deletions