Mutation checking loop re-checks the cluster setting on each iteration.

automatic_stats.go

						for tableID, rowsAffected := range mutationCounts {
							// Check the cluster setting and table setting before each refresh
							// in case it was disabled recently.
							var enabledForTable bool
							if enabled, ok := autoStatsEnabledForTable[tableID]; ok {
								if !enabled {
									break
								}
								enabledForTable = true
							} else if !AutomaticStatisticsClusterMode.Get(&r.st.SV) {
								if len(autoStatsEnabledForTable) == 0 {
									break
								} else {
									continue
								}
							}