statistics: fix entry too large when to save historical stats (#47653)

close #47649
pingcap · Oct 16, 2023 · 541ac59 · 541ac59
1 parent f4f8cd6
commit 541ac59
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/pkg/statistics/handle/history/history_stats.go b/pkg/statistics/handle/history/history_stats.go
@@ -139,7 +139,8 @@ func RecordHistoricalStatsMeta(sctx sessionctx.Context, tableID int64, version u
 }
 
 // Max column size is 6MB. Refer https://docs.pingcap.com/tidb/dev/tidb-limitations/#limitation-on-a-single-column
-const maxColumnSize = 6 << 20
+// but here is less than 6MB, because stats_history has other info except stats_data.
+const maxColumnSize = 5 << 20
 
 // RecordHistoricalStatsToStorage records the given table's stats data to mysql.stats_history
 func RecordHistoricalStatsToStorage(sctx sessionctx.Context, physicalID int64, js *storage.JSONTable) (uint64, error) {