sql: drain queries awaited in the same tick as close()/end()

src/js/internal/sql/query.ts

@@ -149,8 +149,8 @@ class Query<T, Handle extends BaseQueryHandle<any>> extends PublicPromise<T> {
       return this;
     }
 
-    await Promise.$resolve();
-
+    // Hand the query to the pool synchronously so a same-tick close() sees it
+    // as pending; the executed flag above guards re-entry from then()/finally().
     try {
       return handler(this, handle);
     } catch (err) {

src/js/internal/sql/shared.ts

@@ -1228,7 +1228,7 @@ abstract class BaseSQLAdapter<PooledConnection extends BasePooledConnection, Con
     }
 
     let timeout = options?.timeout;
-    if (timeout) {
+    if (timeout != null) {
       timeout = Number(timeout);
       if (timeout > 2 ** 31 || timeout < 0 || timeout !== timeout) {
         throw $ERR_INVALID_ARG_VALUE("options.timeout", timeout, "must be a non-negative integer less than 2^31");

test/js/sql/sql-mysql.test.ts

@@ -971,6 +971,16 @@ if (isDockerEnabled()) {
           return expect(await promise).toEqual([{ x: 0 }]);
         });
 
+        // Same contract as the .execute() case above, but via .then(): the query
+        // was handed to the pool one microtask late, so a same-tick end() ran
+        // first and rejected it with ERR_MYSQL_CONNECTION_CLOSED.
+        test("Connection end does not cancel a query awaited in the same tick", async () => {
+          const sql = new SQL({ ...getOptions(), max: 1 });
+          await sql`select 1 as x`;
+          const [rows] = await Promise.all([sql`select 1 as x`.then(r => r), sql.end()]);
+          expect(rows).toEqual([{ x: 1 }]);
+        });
+
         test("Connection destroyed", async () => {
           const sql = new SQL(getOptions());
           process.nextTick(() => sql.end({ timeout: 0 }));

test/js/sql/sql.test.ts

@@ -1790,6 +1790,23 @@ if (isDockerEnabled()) {
       return expect(await promise).toEqual([{ x: "" }]);
     });
 
+    // Same contract as the .execute() case above, but via .then(): the query
+    // was handed to the pool one microtask late, so a same-tick end() ran
+    // first and rejected it with ERR_POSTGRES_CONNECTION_CLOSED.
+    test("Connection end does not cancel a query awaited in the same tick", async () => {
+      const sql = postgres({ ...options, max: 1 });
+      await sql`select 1 as x`;
+      const [rows] = await Promise.all([sql`select 1 as x`.then(r => r), sql.end()]);
+      expect(rows).toEqual([{ x: 1 }]);
+    });
+
+    test("Connection end with a timeout does not cancel a query awaited in the same tick", async () => {
+      const sql = postgres({ ...options, max: 1 });
+      await sql`select 1 as x`;
+      const [rows] = await Promise.all([sql`select 1 as x`.then(r => r), sql.end({ timeout: 5 })]);
+      expect(rows).toEqual([{ x: 1 }]);
+    });
+
     test("Connection destroyed", async () => {
       const sql = postgres(options);
       process.nextTick(() => sql.end({ timeout: 0 }));

test/js/sql/sqlite-sql.test.ts

@@ -1,6 +1,6 @@
 import { randomUUIDv7, SQL } from "bun";
 import { afterAll, afterEach, beforeAll, beforeEach, describe, expect, mock, test } from "bun:test";
-import { tempDirWithFiles } from "harness";
+import { isDebug, tempDirWithFiles } from "harness";
 import { existsSync } from "node:fs";
 import { rm, stat } from "node:fs/promises";
 import { join } from "node:path";
@@ -1835,6 +1835,16 @@ describe("Connection management", () => {
     }
   });
 
+  // Query.then() used to defer the pool hand-off by one microtask, so a
+  // close() in the same synchronous block ran first, saw zero pending
+  // queries, and rejected the already-awaited query with "Connection closed".
+  test("close() drains a query awaited in the same tick", async () => {
+    const sql = new SQL("sqlite://:memory:");
+    await sql`SELECT 1 AS x`;
+    const [rows] = await Promise.all([sql`SELECT 42 AS x`.then(r => r), sql.close()]);
+    expect(rows).toEqual([{ x: 42 }]);
+  });
+
   test("reserve throws for SQLite", async () => {
     const sql = new SQL("sqlite://:memory:");
 
@@ -2014,7 +2024,7 @@ describe("Memory and resource management", () => {
 
     await sql`CREATE TABLE stmt_test (id INTEGER PRIMARY KEY, value TEXT)`;
 
-    const iterations = 10000;
+    const iterations = isDebug ? 1000 : 10000;
 
     for (let i = 0; i < iterations; i++) {
       await sql`INSERT INTO stmt_test (id, value) VALUES (${i}, ${"test" + i})`;