fix: queryToSql omitted TOPK clause for vector search — flat WASM search returned wrong result count

Author: teamchong

src/wasm-engine.integration.test.ts

@@ -398,4 +398,13 @@ describe("queryToSql", () => {
     const sql = queryToSql({ ...base, offset: 0 });
     expect(sql).toContain("OFFSET 0");
   });
+
+  it("includes TOPK in vector search SQL", () => {
+    const sql = queryToSql({
+      ...base,
+      vectorSearch: { column: "embedding", queryVector: new Float32Array([0.1, 0.2, 0.3]), topK: 10 },
+    });
+    expect(sql).toContain("NEAR [");
+    expect(sql).toContain("TOPK 10");
+  });
 });

src/wasm-engine.ts

@@ -1071,7 +1071,7 @@ export function queryToSql(query: QueryDescriptor): string {
     for (let i = 0; i < vs.queryVector.length; i++) { if (i > 0) vecStr += ","; vecStr += vs.queryVector[i]; }
     vecStr += "]";
     const hasWhere = andConditions.length > 0 || orGroupConditions.length > 0;
-    parts.push(`${hasWhere ? "AND" : "WHERE"} ${quote(vs.column)} NEAR ${vecStr}`);
+    parts.push(`${hasWhere ? "AND" : "WHERE"} ${quote(vs.column)} NEAR ${vecStr} TOPK ${vs.topK}`);
   }
 
   if (query.groupBy?.length) parts.push(`GROUP BY ${query.groupBy.map(quote).join(", ")}`);