diff --git a/src/pl/sys_package/ob_dbms_stats.cpp b/src/pl/sys_package/ob_dbms_stats.cpp
index 0bc93bb74e88df13c63a241e0dbcc0da80e916e4..7b1c29ff2347c4828f0f6f136b03a72ca7fb79de 100644
--- a/src/pl/sys_package/ob_dbms_stats.cpp
+++ b/src/pl/sys_package/ob_dbms_stats.cpp
@@ -3738,7 +3738,7 @@ int ObDbmsStats::parse_gather_stat_options(ObExecContext &ctx,
 {
   int ret = OB_SUCCESS;
   UNUSED(ctx);
-  int64_t stat_options = StatOptionFlags::OPT_APPROXIMATE_NDV;
+  int64_t stat_options = StatOptionFlags::OPT_APPROXIMATE_NDV | StatOptionFlags::OPT_ESTIMATE_BLOCK;
   number::ObNumber num_est_percent;
   number::ObNumber num_degree;
   double percent = 0.0;
@@ -3935,6 +3935,14 @@ int ObDbmsStats::get_default_stat_options(ObExecContext &ctx,
       LOG_WARN("failed to push back", K(ret));
     }
   }
+  if (OB_SUCC(ret) && stat_options & StatOptionFlags::OPT_ESTIMATE_BLOCK) {
+    ObEstimateBlockPrefs *tmp_pref = NULL;
+    if (OB_FAIL(new_stat_prefs(ctx.get_allocator(), ctx.get_my_session(), ObString(), tmp_pref))) {
+      LOG_WARN("failed to new stat prefs", K(ret));
+    } else if (OB_FAIL(stat_prefs.push_back(tmp_pref))) {
+      LOG_WARN("failed to push back", K(ret));
+    }
+  }
   if (OB_SUCC(ret)) {
     if (OB_FAIL(ObDbmsStatsPreferences::get_sys_default_stat_options(ctx, stat_prefs, param))) {
       LOG_WARN("failed to get sys default stat options", K(ret));
@@ -5588,6 +5596,7 @@ int ObDbmsStats::gather_table_stats_with_default_param(ObExecContext &ctx,
  *     CONCURRENT, DEBUG, ENABLE_HYBRID_HISTOGRAMS, INCREMENTAL_INTERNAL_CONTROL, JOB_OVERHEAD,
  *     JOB_OVERHEAD_PERC, PREFERENCE_OVERRIDES_PARAMETER, SCAN_RATE, STAT_CATEGORY, SYS_FLAGS,
  *     TRACE, WAIT_TIME_TO_UPDATE_STATS
+ *  add new prefs for OceanBase: ESTIMATE_BLOCK
    https://docs.oracle.com/database/121/ARPLS/d_stats.htm#ARPLS68674
 */
 int ObDbmsStats::get_new_stat_pref(ObExecContext &ctx,
@@ -5676,13 +5685,20 @@ int ObDbmsStats::get_new_stat_pref(ObExecContext &ctx,
     } else {
       stat_pref = tmp_pref;
     }
+  } else if (is_global_prefs && 0 == opt_name.case_compare("ESTIMATE_BLOCK")) {
+    ObEstimateBlockPrefs *tmp_pref = NULL;
+    if (OB_FAIL(new_stat_prefs(ctx.get_allocator(), ctx.get_my_session(), opt_value, tmp_pref))) {
+      LOG_WARN("failed to new stat prefs", K(ret));
+    } else {
+      stat_pref = tmp_pref;
+    }
   } else {
     ret = OB_ERR_DBMS_STATS_PL;
     LOG_WARN("Invalid input values for pname", K(ret), K(opt_name));
     LOG_USER_ERROR(OB_ERR_DBMS_STATS_PL, "Invalid input values for pname, Only Support CASCADE |"\
                                        "DEGREE | ESTIMATE_PERCENT | GRANULARITY | INCREMENTAL |"\
                                        "INCREMENTAL_LEVEL | METHOD_OPT | NO_INVALIDATE | OPTIONS"\
-                                      "STALE_PERCENT | APPROXIMATE_NDV(global prefs unique) prefs");
+                                      "STALE_PERCENT | ESTIMATE_BLOCK | APPROXIMATE_NDV(global prefs unique) prefs");
   }
   return ret;
 }
diff --git a/src/share/stat/ob_dbms_stats_executor.cpp b/src/share/stat/ob_dbms_stats_executor.cpp
index 6de862957f84cf91eda253ed4d04e068cb5ce4b9..c855c0e063b105932107ad88b45577b04f26108a 100644
--- a/src/share/stat/ob_dbms_stats_executor.cpp
+++ b/src/share/stat/ob_dbms_stats_executor.cpp
@@ -45,7 +45,8 @@ int ObDbmsStatsExecutor::gather_table_stats(ObExecContext &ctx,
                                                    ObModIds::OB_HASH_BUCKET_TABLE_STATISTICS,
                                                    param.tenant_id_))) {
     LOG_WARN("failed to create hash map", K(ret));
-  } else if (OB_FAIL(ObBasicStatsEstimator::estimate_block_count(ctx, param,
+  } else if (param.need_estimate_block_ &&
+             OB_FAIL(ObBasicStatsEstimator::estimate_block_count(ctx, param,
                                                                  extra.partition_id_block_map_))) {
     LOG_WARN("failed to estimate block count", K(ret));
   }
diff --git a/src/share/stat/ob_dbms_stats_preferences.cpp b/src/share/stat/ob_dbms_stats_preferences.cpp
index a5489d8d674ca15c1b535737c79ab590d6b8d155..aac69be0ead6be9e6bee9379c455ab5d2c6bb617 100644
--- a/src/share/stat/ob_dbms_stats_preferences.cpp
+++ b/src/share/stat/ob_dbms_stats_preferences.cpp
@@ -529,7 +529,23 @@ int ObDbmsStatsPreferences::gen_init_global_prefs_sql(ObSqlString &raw_sql,
       ret = OB_ERR_UNEXPECTED;
       LOG_WARN("get unexpected error", K(ret), K(prefs.get_stat_pref_name()),
                                        K(prefs.get_stat_pref_default_value()));
-    } else if (OB_FAIL(value_str.append_fmt("('%s', %s, %s, '%s')",
+    } else if (OB_FAIL(value_str.append_fmt("('%s', %s, %s, '%s'),",
+                                            prefs.get_stat_pref_name(),
+                                            null_str,
+                                            time_str,
+                                            prefs.get_stat_pref_default_value()))) {
+      LOG_WARN("failed to append", K(ret));
+    } else {
+      ++ total_rows;
+    }
+  }
+  if (OB_SUCC(ret)) {//init estimate_block
+    ObEstimateBlockPrefs prefs;
+    if (OB_ISNULL(prefs.get_stat_pref_name()) || OB_ISNULL(prefs.get_stat_pref_default_value())) {
+      ret = OB_ERR_UNEXPECTED;
+      LOG_WARN("get unexpected error", K(ret), K(prefs.get_stat_pref_name()),
+                                       K(prefs.get_stat_pref_default_value()));
+    } else if (OB_FAIL(value_str.append_fmt("('%s', %s, %s, '%s');",
                                             prefs.get_stat_pref_name(),
                                             null_str,
                                             time_str,
@@ -1032,6 +1048,26 @@ int ObApproximateNdvPrefs::check_pref_value_validity(ObTableStatParam *param/*de
   return ret;
 }
 
+int ObEstimateBlockPrefs::check_pref_value_validity(ObTableStatParam *param/*default null*/)
+{
+  int ret = OB_SUCCESS;
+  if (pvalue_.empty() ||
+      0 == pvalue_.case_compare("TRUE")) {
+    if (param != NULL) {
+      param->need_estimate_block_ = true;
+    }
+  } else if (0 == pvalue_.case_compare("FALSE")) {
+    if (param != NULL) {
+      param->need_estimate_block_ = false;
+    }
+  } else {
+    ret = OB_ERR_DBMS_STATS_PL;
+    LOG_WARN("Illegal value for ESTIMATE_BLOCK", K(ret), K(pvalue_));
+    LOG_USER_ERROR(OB_ERR_DBMS_STATS_PL,"Illegal value for ESTIMATE_BLOCK: must be {TRUE, FALSE}");
+  }
+  return ret;
+}
+
 #define ISSPACE(c) ((c) == ' ' || (c) == '\n' || (c) == '\r' || (c) == '\t' || (c) == '\f' || (c) == '\v')
 
 //compatible oracle, global prefs/schema prefs just only can set "for all columns...."
diff --git a/src/share/stat/ob_dbms_stats_preferences.h b/src/share/stat/ob_dbms_stats_preferences.h
index 6e9ae51c4d78c2c088d15aaa16e8a2f24b538aad..2303fcd6f9b5a3aacff8b8aa0a6d3c2f52132ce3 100644
--- a/src/share/stat/ob_dbms_stats_preferences.h
+++ b/src/share/stat/ob_dbms_stats_preferences.h
@@ -201,6 +201,19 @@ class ObApproximateNdvPrefs : public ObStatPrefs
     virtual const char* get_stat_pref_default_value() const { return "TRUE"; }
 };
 
+class ObEstimateBlockPrefs : public ObStatPrefs
+{
+  public:
+    ObEstimateBlockPrefs() : ObStatPrefs() {}
+    ObEstimateBlockPrefs(ObIAllocator *alloc,
+                          ObSQLSessionInfo *session_info,
+                          const ObString &pvalue) :
+      ObStatPrefs(alloc, session_info, pvalue) {}
+    virtual int check_pref_value_validity(ObTableStatParam *param = NULL) override;
+    virtual const char* get_stat_pref_name() const { return "ESTIMATE_BLOCK"; }
+    virtual const char* get_stat_pref_default_value() const { return "TRUE"; }
+};
+
 template <class T>
 static int new_stat_prefs(ObIAllocator &allocator, ObSQLSessionInfo *session_info,
                           const ObString &opt_value, T *&src)
diff --git a/src/share/stat/ob_index_stats_estimator.cpp b/src/share/stat/ob_index_stats_estimator.cpp
index 0fea173abb21912340661fb2e92258673d51140c..94922a90ae993e340fcdc2b6adba3a8946ee8760 100644
--- a/src/share/stat/ob_index_stats_estimator.cpp
+++ b/src/share/stat/ob_index_stats_estimator.cpp
@@ -258,7 +258,8 @@ int ObIndexStatsEstimator::fast_gather_index_stats(ObExecContext &ctx,
     LOG_WARN("get unexpected error", K(index_param.is_global_index_), K(gather_part_ids.count()));
   } else if (mgr.get_table_stat(data_param.tenant_id_, data_param.table_id_, gather_part_ids, data_table_stats)) {
     LOG_WARN("failed to get table stat", K(ret));
-  } else if (OB_FAIL(partition_id_block_map.create(10000,
+  } else if (index_param.need_estimate_block_ &&
+             OB_FAIL(partition_id_block_map.create(10000,
                                                    ObModIds::OB_HASH_BUCKET_TABLE_STATISTICS,
                                                    ObModIds::OB_HASH_BUCKET_TABLE_STATISTICS,
                                                    index_param.tenant_id_))) {
diff --git a/src/share/stat/ob_stat_define.cpp b/src/share/stat/ob_stat_define.cpp
index 395af49ca780d0bba75fff17bc5e3d6292583741..89ed264b7b85787524a84e5c63ccc304ec8f72b5 100644
--- a/src/share/stat/ob_stat_define.cpp
+++ b/src/share/stat/ob_stat_define.cpp
@@ -115,6 +115,7 @@ int ObTableStatParam::assign(const ObTableStatParam &other)
   global_tablet_id_ = other.global_tablet_id_;
   global_data_part_id_ = other.global_data_part_id_;
   data_table_id_ = other.data_table_id_;
+  need_estimate_block_ = other.need_estimate_block_;
   if (OB_FAIL(part_infos_.assign(other.part_infos_))) {
     LOG_WARN("failed to assign", K(ret));
   } else if (OB_FAIL(subpart_infos_.assign(other.subpart_infos_))) {
diff --git a/src/share/stat/ob_stat_define.h b/src/share/stat/ob_stat_define.h
index d2585b7c2fd9d42c044dd2d016179b4234ec6ae3..d6c93d5db5e344622eeb2784f379ec99279e5bd2 100644
--- a/src/share/stat/ob_stat_define.h
+++ b/src/share/stat/ob_stat_define.h
@@ -44,7 +44,8 @@ enum StatOptionFlags
   OPT_STATTYPE         = 1 << 10,
   OPT_FORCE            = 1 << 11,
   OPT_APPROXIMATE_NDV  = 1 << 12,
-  OPT_STAT_OPTION_ALL  = (1 << 13) -1
+  OPT_ESTIMATE_BLOCK   = 1 << 13,
+  OPT_STAT_OPTION_ALL  = (1 << 14) -1
 };
 const static double OPT_DEFAULT_STALE_PERCENT = 0.1;
 const static int64_t OPT_DEFAULT_STATS_RETENTION = 31;
@@ -289,7 +290,8 @@ struct ObTableStatParam {
     duration_time_(-1),
     global_tablet_id_(0),
     global_data_part_id_(INVALID_GLOBAL_PART_ID),
-    data_table_id_(INVALID_GLOBAL_PART_ID)
+    data_table_id_(INVALID_GLOBAL_PART_ID),
+    need_estimate_block_(true)
   {}
 
   int assign(const ObTableStatParam &other);
@@ -360,6 +362,7 @@ struct ObTableStatParam {
   uint64_t global_tablet_id_;
   int64_t global_data_part_id_; // used to check wether table is locked, while gathering index stats.
   int64_t data_table_id_; // the data table id for index schema
+  bool need_estimate_block_;//need estimate macro/micro block count
 
   TO_STRING_KV(K(tenant_id_),
                K(db_name_),
@@ -402,7 +405,8 @@ struct ObTableStatParam {
                K(duration_time_),
                K(global_tablet_id_),
                K(global_data_part_id_),
-               K(data_table_id_));
+               K(data_table_id_),
+               K(need_estimate_block_));
 };
 
 struct ObOptStat
diff --git a/src/sql/resolver/expr/ob_raw_expr_resolver_impl.cpp b/src/sql/resolver/expr/ob_raw_expr_resolver_impl.cpp
index bbd36e7c02b21d9f09de4f0fa2c46fd7f1f49cab..2930e014d2df1697cf636aa57eb2e93289d14fdd 100644
--- a/src/sql/resolver/expr/ob_raw_expr_resolver_impl.cpp
+++ b/src/sql/resolver/expr/ob_raw_expr_resolver_impl.cpp
@@ -6486,6 +6486,7 @@ int ObRawExprResolverImpl::process_odbc_time_literals(const ObItemType dst_time_
       tmp_node.num_child_ = 0;
       tmp_node.str_len_ = time_str.length();
       tmp_node.str_value_ = time_str.ptr();
+      tmp_node.is_date_unit_ = false;
       if (OB_FAIL(process_datatype_or_questionmark(tmp_node, expr))) {
         if (ret == OB_ERR_WRONG_VALUE) {//invalid time str, go back default way like Mysql.
           ret = OB_SUCCESS;