statistics: avoid update delta when delta modified count is 0 (#5164)

pingcap · Nov 21, 2017 · edcb9e9 · edcb9e9
1 parent f161bdc
commit edcb9e9
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/statistics/update.go b/statistics/update.go
@@ -121,6 +121,9 @@ func (h *Handle) DumpStatsDeltaToKV() {
 
 // dumpTableStatDeltaToKV dumps a single delta with some table to KV and updates the version.
 func (h *Handle) dumpTableStatDeltaToKV(id int64, delta variable.TableDelta) error {
+	if delta.Count == 0 {
+		return nil
+	}
 	_, err := h.ctx.(sqlexec.SQLExecutor).Execute("begin")
 	if err != nil {
 		return errors.Trace(err)