*: improve executor to make test faster

expression/BUILD.bazel

@@ -172,7 +172,6 @@ go_test(
         "expression_test.go",
         "function_traits_test.go",
         "helper_test.go",
-        "integration_serial_test.go",
         "main_test.go",
         "multi_valued_index_test.go",
         "scalar_function_test.go",

expression/integration_serial_test/BUILD.bazel

@@ -0,0 +1,31 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_test")
+
+go_test(
+    name = "integration_serial_test_test",
+    timeout = "short",
+    srcs = [
+        "integration_serial_test.go",
+        "main_test.go",
+    ],
+    flaky = True,
+    shard_count = 50,
+    deps = [
+        "//config",
+        "//parser/mysql",
+        "//parser/terror",
+        "//planner/core",
+        "//session",
+        "//sessionctx/variable",
+        "//testkit",
+        "//testkit/testmain",
+        "//testkit/testsetup",
+        "//types",
+        "//util/timeutil",
+        "@com_github_pingcap_errors//:errors",
+        "@com_github_pingcap_failpoint//:failpoint",
+        "@com_github_stretchr_testify//require",
+        "@com_github_tikv_client_go_v2//oracle",
+        "@com_github_tikv_client_go_v2//tikv",
+        "@org_uber_go_goleak//:goleak",
+    ],
+)

expression/integration_serial_test/README.md

@@ -0,0 +1,3 @@
+Too many test case in this package.
+
+Please not add new test cases in this package. 

expression/integration_serial_test.go → expression/integration_serial_test/integration_serial_test.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package expression_test
+package integration_serial_test
 
 import (
 	"context"

expression/integration_serial_test/main_test.go

@@ -0,0 +1,53 @@
+// Copyright 2023 PingCAP, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package integration_serial_test
+
+import (
+	"testing"
+
+	"github.com/pingcap/tidb/config"
+	"github.com/pingcap/tidb/testkit/testmain"
+	"github.com/pingcap/tidb/testkit/testsetup"
+	"github.com/pingcap/tidb/util/timeutil"
+	"github.com/tikv/client-go/v2/tikv"
+	"go.uber.org/goleak"
+)
+
+func TestMain(m *testing.M) {
+	testsetup.SetupForCommonTest()
+	testmain.ShortCircuitForBench(m)
+
+	config.UpdateGlobal(func(conf *config.Config) {
+		conf.TiKVClient.AsyncCommit.SafeWindow = 0
+		conf.TiKVClient.AsyncCommit.AllowedClockDrift = 0
+		conf.Experimental.AllowsExpressionIndex = true
+	})
+	tikv.EnableFailpoints()
+
+	// Some test depends on the values of timeutil.SystemLocation()
+	// If we don't SetSystemTZ() here, the value would change unpredictable.
+	// Affected by the order whether a testsuite runs before or after integration test.
+	// Note, SetSystemTZ() is a sync.Once operation.
+	timeutil.SetSystemTZ("system")
+
+	opts := []goleak.Option{
+		goleak.IgnoreTopFunction("github.com/golang/glog.(*loggingT).flushDaemon"),
+		goleak.IgnoreTopFunction("github.com/lestrrat-go/httprc.runFetchWorker"),
+		goleak.IgnoreTopFunction("go.etcd.io/etcd/client/pkg/v3/logutil.(*MergeLogger).outputLoop"),
+		goleak.IgnoreTopFunction("go.opencensus.io/stats/view.(*worker).start"),
+	}
+
+	goleak.VerifyTestMain(m, opts...)
+}

expression/integration_test/README.md

@@ -0,0 +1,3 @@
+Too many test case in this package.
+
+Please not add new test cases in this package.