fix issue #2552 (#3300)

database/gdb/gdb_core_utility.go

@@ -155,7 +155,7 @@ func (c *Core) ClearTableFields(ctx context.Context, table string, schema ...str
 func (c *Core) ClearTableFieldsAll(ctx context.Context) (err error) {
 	var (
 		keys        = tableFieldsMap.Keys()
-		cachePrefix = fmt.Sprintf(`%s@%s`, cachePrefixTableFields, c.db.GetGroup())
+		cachePrefix = fmt.Sprintf(`%s%s`, cachePrefixTableFields, c.db.GetGroup())
 		removedKeys = make([]string, 0)
 	)
 	for _, key := range keys {

database/gdb/gdb_driver_wrapper_db.go

@@ -68,6 +68,7 @@ func (d *DriverWrapperDB) TableFields(
 		)
 	}
 	var (
+		// prefix:group@schema#table
 		cacheKey = fmt.Sprintf(
 			`%s%s@%s#%s`,
 			cachePrefixTableFields,