claude@clouddev1
24c268541e
Two layered fixes for the same bug class: `select sum(Age) from
Customers` runs cleanly at the engine but the validator was treating
`sum` as a column reference. The grammar already admits function
calls structurally (ADR-0031 §1: "it does not know which names are
aggregates"); the validator needed to match.
1. Walker (schema_existence_diagnostics): the bare-column check on
`sql_expr_ident` items now skips when the ident is immediately
followed by `(` — it's a function-call name, not a column. New
helper `is_followed_by_call_args` mirrors the existing
`is_followed_by_qualified_ref` guard. Args inside the call are
ordinary expressions and their idents still flow through the
normal bare-column check on subsequent iterations.
Cascades to: the [ERR] validity indicator (verdict derived from
diagnostics), the red highlight overlay (renderer overlays
diagnostic spans), and the ambient hint at complete inputs (the
diagnostic-driven `pick_hint_diagnostic` path).
2. Typing-time (invalid_ident_at_cursor_in_mode): at any
`sql_expr_ident` position the partial could resolve to either a
column reference or a function-call name; without lookahead for a
trailing `(` we can't tell. The check now returns early at
`sql_expr_ident` positions. Submit-time still catches genuine
column typos: the schema-existence diagnostic only skips when the
ident *is* followed by `(`, so a bare unknown ident still trips
and the hint surfaces it via `pick_hint_diagnostic`.
Trade-off worth flagging: typing `select Agx` (no FROM yet) is now
silent until FROM is added; previously the typing-time path flagged
it as "No such column". This makes typing-time consistent with
submit-time — the schema-existence pass already silently skips
no-FROM expressions ("no FROM in scope — engine catches"). For any
expression-with-scope (SELECT with FROM, WHERE, etc.) the
diagnostic-driven hint still fires for column typos; new test pins
this.
Tests added (5): walker positive (every standard aggregate plus
count(*), count(distinct …), nested calls, WHERE-clause functions,
and non-aggregate functions), walker negative (unknown column inside
call args), walker negative for DISTINCT-shielded arg, typing-time
positive (no false flag on partial function name), typing-time
trade-off lockdown (genuine column typo still hints when FROM is in
scope).
No grammar change; no ADR amendment (the fix matches ADR-0031 §1's
existing posture). Full suite 2040 passed / 0 failed / 0 unexpected
skips. Clippy clean.