diff --git a/src/share/stat/ob_opt_osg_column_stat.cpp b/src/share/stat/ob_opt_osg_column_stat.cpp
index 8720981475..dc716473db 100644
--- a/src/share/stat/ob_opt_osg_column_stat.cpp
+++ b/src/share/stat/ob_opt_osg_column_stat.cpp
@@ -244,11 +244,13 @@ int ObOptOSGColumnStat::inner_merge_min(const ObDatum &datum, const ObObjMeta &m
       min_val_.meta_ = meta;
       min_val_.cmp_func_ = cmp_func;
     }
+    LOG_TRACE("succeed to merge min datum", K(*min_val_.datum_), K(datum), K(meta));
   } else if (min_val_.datum_->is_null()) {
     inner_min_allocator_.reuse();
     if (OB_FAIL(min_val_.datum_->deep_copy(datum, inner_min_allocator_))) {
       LOG_WARN("failed to deep copy datum");
     }
+    LOG_TRACE("succeed to merge min datum", K(*min_val_.datum_), K(datum), K(meta));
   } else {
     int cmp_ret = 0;
     if (OB_FAIL(min_val_.cmp_func_(*min_val_.datum_, datum, cmp_ret))) {
diff --git a/src/share/stat/ob_opt_osg_column_stat.h b/src/share/stat/ob_opt_osg_column_stat.h
index 5438379757..d666310423 100644
--- a/src/share/stat/ob_opt_osg_column_stat.h
+++ b/src/share/stat/ob_opt_osg_column_stat.h
@@ -97,7 +97,9 @@ public:
   ObArenaAllocator inner_max_allocator_;
   ObArenaAllocator inner_allocator_;
   ObIAllocator &allocator_;
-  TO_STRING_KV(K_(col_stat));
+  TO_STRING_KV(K_(col_stat),
+               K_(min_val),
+               K_(max_val));
 private:
   int inner_merge_min(const ObDatum &datum, const ObObjMeta &meta, const ObDatumCmpFuncType cmp_func);
   int inner_merge_max(const ObDatum &datum, const ObObjMeta &meta, const ObDatumCmpFuncType cmp_func);
diff --git a/src/share/table/ob_table_load_define.h b/src/share/table/ob_table_load_define.h
index 9df0e7c734..90b1f3aa31 100644
--- a/src/share/table/ob_table_load_define.h
+++ b/src/share/table/ob_table_load_define.h
@@ -543,6 +543,21 @@ public:
     }
     return ret;
   }
+
+  int persistence_col_stats()
+  {
+    int ret = OB_SUCCESS;
+    for (int64_t i = 0; OB_SUCC(ret) && i < col_stat_array_.count(); ++i) {
+      if (OB_ISNULL(col_stat_array_.at(i))) {
+        ret = OB_ERR_UNEXPECTED;
+        OB_LOG(WARN, "get unexpected null");
+      } else if (OB_FAIL(col_stat_array_.at(i)->set_min_max_datum_to_obj())) {
+        OB_LOG(WARN, "failed to persistence min max");
+      }
+    }
+    return ret;
+  }
+
   TO_STRING_KV(K_(col_stat_array), K_(table_stat_array));
 public:
   common::ObSEArray<ObOptTableStat *, 64> table_stat_array_;
diff --git a/src/sql/optimizer/ob_insert_log_plan.cpp b/src/sql/optimizer/ob_insert_log_plan.cpp
index ebd058526c..2d0059b551 100644
--- a/src/sql/optimizer/ob_insert_log_plan.cpp
+++ b/src/sql/optimizer/ob_insert_log_plan.cpp
@@ -170,8 +170,9 @@ int ObInsertLogPlan::generate_osg_share_info(OSGShareInfo *&info)
     LOG_WARN("failed to allocate memory");
   } else {
     stmt = static_cast<const ObInsertStmt *>(get_stmt());
-    uint64_t table_id = stmt->get_insert_table_info().table_id_;
-    uint64_t ref_table_id = stmt->get_insert_table_info().ref_table_id_;
+    const ObInsertTableInfo& table_info = stmt->get_insert_table_info();
+    uint64_t table_id = table_info.table_id_;
+    uint64_t ref_table_id = table_info.ref_table_id_;
     if (OB_FAIL(schema_guard->get_table_schema(table_id, ref_table_id, stmt, tab_schema))) {
       LOG_WARN("fail to get table schema", K(ref_table_id), K(tab_schema), K(ret));
     } else if (OB_ISNULL(tab_schema)) {
@@ -179,12 +180,11 @@ int ObInsertLogPlan::generate_osg_share_info(OSGShareInfo *&info)
       LOG_WARN("get unexpected null pointer", K(ret));
     } else {
       const ObColumnSchemaV2 *col_schema = NULL;
-      const ObInsertTableInfo& table_info = stmt->get_insert_table_info();
       ObSEArray<uint64_t, 4> generated_column_ids;
       info->table_id_ = ref_table_id;
       if (tab_schema->is_partitioned_table()) {
         info->part_level_ = tab_schema->get_part_level();
-        if (OB_FAIL(gen_calc_part_id_expr(table_id,
+        if (OB_FAIL(gen_calc_part_id_expr(table_info.loc_table_id_,
                                           ref_table_id,
                                           CALC_PARTITION_TABLET_ID,
                                           info->calc_part_id_expr_))) {
diff --git a/src/storage/direct_load/ob_direct_load_merge_ctx.cpp b/src/storage/direct_load/ob_direct_load_merge_ctx.cpp
index c0040cb9bf..bbcd451926 100644
--- a/src/storage/direct_load/ob_direct_load_merge_ctx.cpp
+++ b/src/storage/direct_load/ob_direct_load_merge_ctx.cpp
@@ -298,6 +298,10 @@ int ObDirectLoadTabletMergeCtx::collect_sql_statistics(
           LOG_WARN("failed to update dml stat local cache", K(ret));
         }
       }
+      // persistence col stat once a merge task finished
+      if (OB_SUCC(ret) && OB_FAIL(sql_statistics.persistence_col_stats())) {
+        LOG_WARN("failed to persistence col stats");
+      }
     }
   }
   return ret;