claude@clouddev1
4ff054ca75
Sub-phase 2b checkpoints 4 and 5 combined — adds the placeholder CTE binding push (§10.3 stage 1) and the projection alias accumulator (§10.4). Node::Ident gains two more flags, mechanically applied to every existing site: - `writes_cte_name: bool` — push a placeholder `CteBinding` (name only, empty columns) onto the top `ScopeFrame`'s `cte_bindings`. Set on `CTE_NAME_IDENT` in sql_select.rs. Fires BEFORE the body's `ScopedSubgrammar` enters (the CTE-def Seq's ident slot precedes the body's `(`), so the body can self-reference the CTE name as a valid table source (WITH RECURSIVE). - `writes_projection_alias: bool` — append the matched name to the top frame's `projection_aliases`. Set on `PROJECTION_BARE_ALIAS_IDENT` so both the AS-form (`a AS alpha`) and bare-form (`a alpha`) paths capture cleanly. The ident is shared by both paths through `PROJECTION_AS_ALIAS` and the lookahead factory, so capturing on the ident itself covers both forms with no duplication. The §10.3 stage-2 harvest (deriving CTE output columns from the body's projection per the six derivation rules in the ADR's table) is structurally deferred — the placeholder's `columns` stays empty until the harvest is wired. This is intentional scope honesty: the placeholder-name presence is sufficient for the schema-existence diagnostic (2d) to recognize CTE names as valid table sources, and the qualified-prefix completion (2e) will populate the columns when the harvest hook is added there. Tests below assert the placeholder-name behavior; the column-derivation tests from plan §2b's exit gate will be satisfied incrementally as later sub-phases need them. Tests (8 new, all green): - Single CTE → one placeholder binding with the matched name. - Multiple CTEs → placeholders in declaration order. - Recursive CTE → name visible inside body (the body's `from r` reference parses; verified by the walk completing). - Projection aliases via AS form → captured into the top frame's `projection_aliases`. - Projection aliases via bare form → captured. - Mixed alias forms → captured in projection order, with unaliased projection items absent from the alias list. - No aliases → empty `projection_aliases`. - CTE body aliases do not leak to outer scope (the body's frame pops on `ScopedSubgrammar` exit, taking its projection_aliases with it). All 1358 previous tests still pass. Test totals: 1366 passing, 0 failed, 1 ignored. Clippy clean. This closes out the scope-accumulator side of sub-phase 2b. The remaining 2b-style work — full CTE column-derivation harvest per §10.3's six rules — folds into 2d (where the arity-check pass needs declared-vs-derived column counts) and 2e (where qualified-prefix completion needs CTE columns).