diff --git a/src/share/stat/ob_stat_define.h b/src/share/stat/ob_stat_define.h
index a9d21dc70..a1fc259c8 100644
--- a/src/share/stat/ob_stat_define.h
+++ b/src/share/stat/ob_stat_define.h
@@ -56,7 +56,8 @@ enum StatOptionFlags
   OPT_ASYNC_GATHER_FULL_TABLE_SIZE = 1 << 16,
   OPT_HIST_EST_PERCENT = 1 << 17,
   OPT_HIST_BLOCK_SAMPLE = 1 << 18,
-  OPT_STAT_OPTION_ALL  = (1 << 19) -1
+  OPT_AUTO_SAMPLE_ROW_COUNT = 1 << 19,
+  OPT_STAT_OPTION_ALL  = (1 << 20) -1
 };
 const static double OPT_DEFAULT_STALE_PERCENT = 0.1;
 const static int64_t OPT_DEFAULT_STATS_RETENTION = 31;
@@ -131,7 +132,8 @@ enum ColumnGatherFlag
   NO_NEED_STAT          = 0,
   VALID_OPT_COL         = 1,
   NEED_BASIC_STAT       = 1 << 1,
-  NEED_AVG_LEN          = 1 << 2
+  NEED_AVG_LEN          = 1 << 2,
+  NEED_REFINE_MIN_MAX   = 1 << 3
 };
 
 enum ObGranularityType