[xorm] Rmove engine group (#60761)

pkg/util/xorm/interface.go

@@ -13,7 +13,7 @@ import (
 	"xorm.io/core"
 )
 
-// Interface defines the interface which Engine, EngineGroup and Session will implementate.
+// Interface defines the interface which Engine and Session will implementate.
 type Interface interface {
 	AllCols() *Session
 	Alias(alias string) *Session
@@ -67,7 +67,7 @@ type Interface interface {
 	Where(interface{}, ...interface{}) *Session
 }
 
-// EngineInterface defines the interface which Engine, EngineGroup will implementate.
+// EngineInterface defines the interface which Engine will implementate.
 type EngineInterface interface {
 	Interface
 
@@ -116,5 +116,4 @@ type EngineInterface interface {
 var (
 	_ Interface       = &Session{}
 	_ EngineInterface = &Engine{}
-	_ EngineInterface = &EngineGroup{}
 )