checksum: use gc ttl api for checksum gc safepoint in v4.0 cluster

lightning/backend/importer.go

@@ -292,13 +292,7 @@ func checkTiDBVersion(tls *common.TLS, requiredVersion semver.Version) error {
 }
 
 func checkPDVersion(tls *common.TLS, pdAddr string, requiredVersion semver.Version) error {
-	var rawVersion string
-	err := tls.WithHost(pdAddr).GetJSON("/pd/api/v1/config/cluster-version", &rawVersion)
-	if err != nil {
-		return err
-	}
-
-	version, err := semver.NewVersion(rawVersion)
+	version, err := common.FetchPDVersion(tls, pdAddr)
 	if err != nil {
 		return errors.Trace(err)
 	}

lightning/checkpoints/tidb.go

@@ -24,6 +24,7 @@ type TidbDBInfo struct {
 
 type TidbTableInfo struct {
 	ID   int64
+	DB   string
 	Name string
 	Core *model.TableInfo
 }

lightning/common/version.go

@@ -16,6 +16,8 @@ package common
 import (
 	"fmt"
 
+	"github.com/coreos/go-semver/semver"
+	"github.com/pingcap/errors"
 	"go.uber.org/zap"
 
 	"github.com/pingcap/tidb-lightning/lightning/log"
@@ -58,3 +60,14 @@ func PrintInfo(app string, callback func()) {
 		callback()
 	}
 }
+
+// FetchPDVersion get pd version
+func FetchPDVersion(tls *TLS, pdAddr string) (*semver.Version, error) {
+	var rawVersion string
+	err := tls.WithHost(pdAddr).GetJSON("/pd/api/v1/config/cluster-version", &rawVersion)
+	if err != nil {
+		return nil, errors.Trace(err)
+	}
+
+	return semver.NewVersion(rawVersion)
+}