feat(duckdb): improve SQL completion keywords

apps/desktop/src/lib/__tests__/sql/sqlCompletion.context.spec.ts

@@ -24,6 +24,33 @@ describe("sqlCompletion keyword snippets", () => {
     expect(shouldAutoOpenSqlCompletion(sql, sql.length)).toBe(true);
     expect(items).toEqual(expect.arrayContaining([expect.objectContaining({ label: "select *", type: "snippet" }), expect.objectContaining({ label: "SELECT", type: "keyword" })]));
   });
+
+  it("offers DuckDB-specific query and statement keywords", () => {
+    const expectedKeywords = ["QUALIFY", "SUMMARIZE", "PIVOT", "UNPIVOT", "ASOF", "POSITIONAL", "FROM"];
+
+    for (const keyword of expectedKeywords) {
+      const prefix = keyword.slice(0, 4);
+      const sql = keyword === "FROM" || keyword === "SUMMARIZE" ? prefix : `SELECT * FROM items ${prefix}`;
+      const items = buildSqlCompletionItems(sql, sql.length, {
+        tables: [],
+        columnsByTable: new Map(),
+        databaseType: "duckdb",
+      });
+
+      expect(items, keyword).toEqual(expect.arrayContaining([expect.objectContaining({ label: keyword, type: "keyword" })]));
+    }
+  });
+
+  it("does not expose DuckDB-only keywords to other databases", () => {
+    const sql = "SELECT * FROM items qua";
+    const items = buildSqlCompletionItems(sql, sql.length, {
+      tables: [],
+      columnsByTable: new Map(),
+      databaseType: "postgres",
+    });
+
+    expect(items.some((item) => item.label === "QUALIFY")).toBe(false);
+  });
 });
 
 describe("SQL Server datepart completion", () => {

apps/desktop/src/lib/sql/sqlCompletion.ts

@@ -456,6 +456,44 @@ const MANTICORESEARCH_SQL_KEYWORDS = ["FACET", "MATCH", "SHOW", "SHOW META", "SH
 
 const SQLITE_SQL_KEYWORDS = ["AUTOINCREMENT", "INTEGER", "BLOB", "BOOLEAN", "WITHOUT ROWID", "VACUUM", "PRAGMA", "JSON_EXTRACT", "JSON_SET", "STRFTIME"];
 
+// DuckDB extends the common SQL grammar with analytical clauses, relation
+// reshaping statements, and a few shorthand forms. Keep these scoped to
+// DuckDB so database-specific completion does not leak into other dialects.
+const DUCKDB_SQL_KEYWORDS = [
+  "ASOF",
+  "ANTI",
+  "COLUMNS",
+  "COPY",
+  "DESCRIBE",
+  "EXCLUDE",
+  "EXPORT",
+  "FILTER",
+  "GROUP BY ALL",
+  "IMPORT",
+  "LATERAL",
+  "LIST",
+  "MAP",
+  "PIVOT",
+  "PIVOT_LONGER",
+  "PIVOT_WIDER",
+  "POSITIONAL",
+  "QUALIFY",
+  "READ_CSV",
+  "READ_JSON",
+  "READ_PARQUET",
+  "REPLACE",
+  "SAMPLE",
+  "SEMI",
+  "SHOW",
+  "STRUCT",
+  "SUMMARIZE",
+  "TABLESAMPLE",
+  "UNION BY NAME",
+  "UNPIVOT",
+  "USING SAMPLE",
+  "WINDOW",
+];
+
 const SQLSERVER_SQL_KEYWORDS = [
   "TOP",
   "IDENTITY",
@@ -585,7 +623,7 @@ const DATABASE_SQL_KEYWORDS: Partial<Record<DatabaseType, string[]>> = {
   oracle: ORACLE_SQL_KEYWORDS,
   "oceanbase-oracle": ORACLE_SQL_KEYWORDS,
   manticoresearch: MANTICORESEARCH_SQL_KEYWORDS,
-  duckdb: ["COMMENT"],
+  duckdb: ["COMMENT", ...DUCKDB_SQL_KEYWORDS],
   clickhouse: ["COMMENT"],
   doris: ["COMMENT", "MATERIALIZED", "MATERIALIZED VIEW", "DISTRIBUTED BY HASH", "DUPLICATE KEY", "AGGREGATE KEY", "UNIQUE KEY", "PRIMARY KEY", "PROPERTIES", "PARTITION BY", "BUCKETS", "LATERAL VIEW", "EXPLODE", "ARRAY", "MAP", "STRUCT", "BITMAP", "HLL"],
   starrocks: ["COMMENT", "MATERIALIZED", "MATERIALIZED VIEW", "DISTRIBUTED BY HASH", "DUPLICATE KEY", "PROPERTIES", "PARTITION BY", "BUCKETS", "LATERAL VIEW"],