grammar+db: 3h — UPSERT ON CONFLICT DO NOTHING / DO UPDATE (ADR-0033 §9)
on_conflict_clause on SQL_INSERT_SHAPE: optional (col,…) conflict target (distinct conflict_target_column role so it never enters listed_columns), DO NOTHING / DO UPDATE SET … [WHERE …]. `do` is factored out of the action Choice so nothing/update disambiguate without tripping the walk_seq/walk_choice shared-prefix trap (ADR-0033 Amendment 1). Worker runs the UPSERT verbatim (SQLite native); no new execution path. build_sql_insert: row_source now stops before the FIRST trailing clause — ON CONFLICT (3h) or RETURNING (3g) — and do_sql_insert's shortid auto-fill rewrite re-appends the whole trailing tail, so an auto-filled INSERT keeps its ON CONFLICT / RETURNING. excluded pseudo-table (§9): resolves to the target's columns inside the DO UPDATE action and completes at `excluded.|`, but stays flagged as unknown_qualifier in VALUES / RETURNING / non-upsert statements. Diagnostic pass scopes it by the DO UPDATE byte-range (update token → RETURNING/end); completion resolves it against the INSERT target's current_table_columns. NOTE: scoping uses byte-range rather than the plan's prescribed from_scope TableBinding push — same behaviour, no walker scope-frame change. Tests (+13): grammar accept/reject; DO NOTHING / DO UPDATE-excluded / no-target execution + persistence; auto-fill × ON CONFLICT with a REAL unique conflict (proves the clause survives the rewrite, not a no-op); excluded resolves in DO UPDATE SET + WHERE, flagged in VALUES (incl. same statement), unknown column under excluded; excluded.| completion; conflict-target not in listed_columns. 1576 pass / 0 fail / 1 ignored. Clippy clean. Dev sql_insert entry word still removed in 3j. Known follow-up (tracked for 3i): UPSERT DO UPDATE bare column refs (SET LHS / WHERE) are not schema-validated, unlike regular UPDATE — the INSERT target isn't a diagnostic binding. Fits 3i's cross-cut SET/WHERE validation scope.
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claude@clouddev1
@@ -14,7 +14,9 @@
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//! sub-phases.
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use crate::dsl::grammar::sql_expr;
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use crate::dsl::grammar::sql_select::{RETURNING_CLAUSE, SQL_SELECT_COMPOUND, reject_internal_table};
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use crate::dsl::grammar::sql_select::{
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RETURNING_CLAUSE, SQL_SELECT_COMPOUND, WHERE_CLAUSE, reject_internal_table,
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};
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use crate::dsl::grammar::{IdentSource, Node, Word};
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static COMMA: Node = Node::Punct(',');
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@@ -105,11 +107,119 @@ const VALUES_CLAUSE: Node = Node::Seq(VALUES_CLAUSE_NODES);
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static ROW_SOURCE_CHOICES: &[Node] = &[VALUES_CLAUSE, Node::Subgrammar(&SQL_SELECT_COMPOUND)];
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const ROW_SOURCE: Node = Node::Choice(ROW_SOURCE_CHOICES);
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// =================================================================
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// ON CONFLICT … DO NOTHING / DO UPDATE (ADR-0033 §9, sub-phase 3h)
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// =================================================================
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/// One column in the optional `ON CONFLICT (col, …)` conflict
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/// target. A DISTINCT role from `insert_column` — the conflict
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/// target names existing unique-constraint columns, not the
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/// inserted column list, and `build_sql_insert` collects only
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/// `insert_column` into `listed_columns` (which drives `shortid`
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/// auto-fill). Sharing the role would corrupt that set.
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static CONFLICT_TARGET_COLUMN: Node = Node::Ident {
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source: IdentSource::Columns,
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role: "conflict_target_column",
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validator: None,
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highlight_override: None,
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writes_table: false,
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writes_column: false,
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writes_user_listed_column: false,
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writes_table_alias: false,
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writes_cte_name: false,
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writes_projection_alias: false,
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};
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static CONFLICT_TARGET_NODES: &[Node] = &[
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Node::Punct('('),
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Node::Repeated {
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inner: &CONFLICT_TARGET_COLUMN,
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separator: Some(&COMMA),
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min: 1,
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},
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Node::Punct(')'),
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];
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/// Optional `(col, …)` conflict target — which unique constraint
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/// to react to. Standard SQL allows omitting it (any conflict).
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const OPTIONAL_CONFLICT_TARGET: Node = Node::Optional(&Node::Seq(CONFLICT_TARGET_NODES));
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/// The column on the left of one `DO UPDATE SET col = expr`
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/// assignment. Mirrors `sql_update`'s `ASSIGN_COLUMN` shape (same
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/// `update_set_column` role so it gets the same column completion /
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/// diagnostics against the target table).
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const UPSERT_SET_COLUMN: Node = Node::Ident {
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source: IdentSource::Columns,
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role: "update_set_column",
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validator: None,
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highlight_override: None,
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writes_table: false,
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writes_column: false,
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writes_user_listed_column: false,
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writes_table_alias: false,
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writes_cte_name: false,
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writes_projection_alias: false,
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};
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/// `column '=' sql_expr` — the RHS reuses the shared expression
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/// grammar (ADR-0031), so `excluded.col`, literals, operators,
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/// `CASE`, and function calls are all admitted. `excluded` is the
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/// would-have-been-inserted row (ADR-0033 §9); it parses as a
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/// qualified ref via `sql_expr` and the engine resolves it.
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static UPSERT_ASSIGNMENT_NODES: &[Node] = &[
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UPSERT_SET_COLUMN,
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Node::Punct('='),
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Node::Subgrammar(&sql_expr::SQL_OR_EXPR),
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];
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static UPSERT_ASSIGNMENT: Node = Node::Seq(UPSERT_ASSIGNMENT_NODES);
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// `const` — used by value in `DO_UPDATE_NODES` (static-vs-const
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// rule: a `Node` referenced by value in a `static [...]` must be
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// `const`; `inner: &UPSERT_ASSIGNMENT` is fine since that one is
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// referenced via `&`).
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const UPSERT_ASSIGNMENT_LIST: Node = Node::Repeated {
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inner: &UPSERT_ASSIGNMENT,
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separator: Some(&COMMA),
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min: 1,
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};
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static DO_UPDATE_NODES: &[Node] = &[
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Node::Word(Word::keyword("update")),
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Node::Word(Word::keyword("set")),
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UPSERT_ASSIGNMENT_LIST,
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Node::Optional(&WHERE_CLAUSE),
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];
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/// The action after the shared `do`: `NOTHING | UPDATE SET … [ WHERE
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/// … ]`. The `do` keyword is factored OUT of this Choice
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/// deliberately. A Choice whose branches *shared* a `do` prefix
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/// would break on the walker's `walk_seq`/`walk_choice` interaction
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/// (ADR-0033 Amendment 1): a branch matching `do` then failing its
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/// *second* token returns a hard `Failed` past idx 0, which stops
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/// `walk_choice` from trying the next branch. With `do` hoisted into
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/// the enclosing Seq, each branch's FIRST token (`nothing` vs
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/// `update`) disambiguates, so a non-match of branch 0 is a clean
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/// `NoMatch` that falls through to branch 1.
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static DO_ACTION_CHOICES: &[Node] =
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&[Node::Word(Word::keyword("nothing")), Node::Seq(DO_UPDATE_NODES)];
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// `const` — used by value in `ON_CONFLICT_CLAUSE_NODES`.
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const DO_ACTION: Node = Node::Choice(DO_ACTION_CHOICES);
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static ON_CONFLICT_CLAUSE_NODES: &[Node] = &[
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Node::Word(Word::keyword("on")),
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Node::Word(Word::keyword("conflict")),
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OPTIONAL_CONFLICT_TARGET,
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Node::Word(Word::keyword("do")),
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DO_ACTION,
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];
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/// `ON CONFLICT [ (col, …) ] DO ( NOTHING | UPDATE SET … )`
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/// (ADR-0033 §9). Sits between the row source and `RETURNING` in
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/// `SQL_INSERT_SHAPE`.
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static ON_CONFLICT_CLAUSE: Node = Node::Seq(ON_CONFLICT_CLAUSE_NODES);
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static SQL_INSERT_TAIL_NODES: &[Node] = &[
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Node::Word(Word::keyword("into")),
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TARGET_TABLE,
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OPTIONAL_COLUMN_LIST,
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ROW_SOURCE,
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Node::Optional(&ON_CONFLICT_CLAUSE),
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Node::Optional(&RETURNING_CLAUSE),
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Node::Optional(&Node::Punct(';')),
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];
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@@ -196,6 +306,33 @@ mod tests {
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good("into orders values (1) returning id as new_id;");
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}
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#[test]
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fn on_conflict_clause_admitted() {
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// 3h: ON CONFLICT … DO NOTHING / DO UPDATE (ADR-0033 §9).
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good("into t (id, name) values (1, 'x') on conflict (id) do nothing");
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good("into t (id, name) values (1, 'x') on conflict do nothing");
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good("into t (id, name) values (1, 'x') on conflict (id) do update set name = excluded.name");
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good("into t (id, name) values (1, 'x') on conflict (id) do update set name = 'y' where id > 0");
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// Multi-column conflict target + multi-assignment DO UPDATE.
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good("into t (a, b) values (1, 2) on conflict (a, b) do update set b = excluded.b, a = 9");
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// ON CONFLICT composes with RETURNING (order: row source,
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// ON CONFLICT, RETURNING).
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good("into t (id) values (1) on conflict (id) do nothing returning *");
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good("into t (id) values (1) on conflict (id) do update set id = excluded.id returning id");
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}
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#[test]
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fn on_conflict_structurally_incomplete_rejected() {
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// `do` with no action.
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bad("into t (id) values (1) on conflict (id) do");
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// DO UPDATE with no SET.
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bad("into t (id) values (1) on conflict (id) do update");
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// DO UPDATE SET with no assignment.
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bad("into t (id) values (1) on conflict (id) do update set");
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// Bare ON with no CONFLICT.
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bad("into t (id) values (1) on do nothing");
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}
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#[test]
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fn internal_target_table_rejected() {
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bad("into __rdbms_playground_columns values (1)");
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