fix some dbms_stats bugs

Author: ChangerR

src/pl/sys_package/ob_dbms_stats.cpp

@@ -1510,7 +1510,7 @@ int ObDbmsStats::export_schema_stats(ObExecContext &ctx, ParamStore &params, ObO
                                       K(stat_table_param.db_name_), K(stat_table_param.tab_name_));
       LOG_USER_ERROR(OB_TABLE_NOT_EXIST, to_cstring(stat_table_param.db_name_),
                                         to_cstring(stat_table_param.tab_name_));
-    } else if (!params.at(2).is_null() && OB_FAIL(params.at(5).get_varchar((stat_table_param.stat_id_)))) {
+    } else if (!params.at(2).is_null() && OB_FAIL(params.at(2).get_varchar((stat_table_param.stat_id_)))) {
       LOG_WARN("failed to get stat id ", K(ret));
     } else {
       ObArenaAllocator tmp_alloc("OptStatExport", OB_MALLOC_NORMAL_BLOCK_SIZE, global_param.tenant_id_);
@@ -1874,7 +1874,7 @@ int ObDbmsStats::import_schema_stats(ObExecContext &ctx, ParamStore &params, ObO
                                       K(stat_table_param.tab_name_));
       LOG_USER_ERROR(OB_TABLE_NOT_EXIST, to_cstring(stat_table_param.db_name_),
                                         to_cstring(stat_table_param.tab_name_));
-    } else if (!params.at(2).is_null() && OB_FAIL(params.at(4).get_varchar(stat_table_param.stat_id_))) {
+    } else if (!params.at(2).is_null() && OB_FAIL(params.at(2).get_varchar(stat_table_param.stat_id_))) {
       LOG_WARN("failed to get stat id ", K(ret));
     } else {
       ObArenaAllocator tmp_alloc("OptStatImport", OB_MALLOC_NORMAL_BLOCK_SIZE, global_param.tenant_id_);

src/share/stat/ob_hybrid_hist_estimator.cpp

@@ -211,6 +211,8 @@ int ObHybridHistEstimator::estimate_no_sample_col_hydrid_hist(ObIAllocator &allo
     LOG_WARN("failed to add no sample hybrid hist stat items", K(ret));
   } else if (OB_FAIL(fill_hints(allocator, param.tab_name_, param.gather_vectorize_, false))) {
     LOG_WARN("failed to fill hints", K(ret));
+  } else if (OB_FAIL(fill_parallel_info(allocator, param.degree_))) {
+    LOG_WARN("failed to fill parallel info", K(ret));
   } else if (OB_FAIL(ObDbmsStatsUtils::get_valid_duration_time(param.gather_start_time_,
                                                                param.max_duration_time_,
                                                                duration_time))) {