.

Signed-off-by: ailinkid <[email protected]>

ddl/util/util.go

@@ -36,7 +36,7 @@ const (
 	completeDeleteMultiRangesSQL = `DELETE FROM mysql.gc_delete_range WHERE job_id = %? AND element_id in (` // + idList + ")"
 	updateDeleteRangeSQL         = `UPDATE mysql.gc_delete_range SET start_key = %? WHERE job_id = %? AND element_id = %? AND start_key = %?`
 	deleteDoneRecordSQL          = `DELETE FROM mysql.gc_delete_range_done WHERE job_id = %? AND element_id = %?`
-	loadGlobalVars               = `SELECT HIGH_PRIORITY variable_name, variable_value from mysql.global_variables where variable_name in (` // + nameList + ")"
+	loadGlobalVars               = `SELECT HIGH_PRIORITY variable_name, variable_value from mysql.global_variables where variable_name in (%?)`
 )
 
 // DelRangeTask is for run delete-range command in gc_worker.
@@ -162,18 +162,7 @@ func LoadDDLVars(ctx sessionctx.Context) error {
 // LoadGlobalVars loads global variable from mysql.global_variables.
 func LoadGlobalVars(ctx sessionctx.Context, varNames []string) error {
 	if sctx, ok := ctx.(sqlexec.RestrictedSQLExecutor); ok {
-		var buf strings.Builder
-		buf.WriteString(loadGlobalVars)
-		paramNames := make([]interface{}, 0, len(varNames))
-		for i, name := range varNames {
-			if i > 0 {
-				buf.WriteString(", ")
-			}
-			buf.WriteString("%?")
-			paramNames = append(paramNames, name)
-		}
-		buf.WriteString(")")
-		stmt, err := sctx.ParseWithParams(context.Background(), buf.String(), paramNames...)
+		stmt, err := sctx.ParseWithParams(context.Background(), loadGlobalVars, varNames)
 		if err != nil {
 			return errors.Trace(err)
 		}