[CP] Fix the issue of incorrect results with batch NLJ + SET OP

src/sql/engine/table/ob_table_scan_op.cpp

@@ -1407,9 +1407,9 @@ int ObTableScanOp::do_init_before_get_row()
 {
   int ret = OB_SUCCESS;
   if (need_init_before_get_row_) {
-    LOG_DEBUG("do init before get row", K(MY_SPEC.use_dist_das_), K(MY_SPEC.gi_above_));
+    LOG_DEBUG("do init before get row", K(MY_SPEC.id_), K(MY_SPEC.use_dist_das_), K(MY_SPEC.gi_above_));
     if (OB_UNLIKELY(iter_end_)) {
-      //do nothing
+      LOG_DEBUG("do init before get row meet iter end", K(MY_SPEC.id_));
     } else {
       if (MY_SPEC.gi_above_) {
         ObGranuleTaskInfo info;

src/sql/optimizer/ob_log_join.cpp

@@ -20,6 +20,7 @@
 #include "sql/optimizer/ob_log_exchange.h"
 #include "sql/optimizer/ob_log_table_scan.h"
 #include "sql/optimizer/ob_log_join_filter.h"
+#include "sql/optimizer/ob_log_set.h"
 #include "sql/optimizer/ob_optimizer_util.h"
 #include "sql/optimizer/ob_log_granule_iterator.h"
 #include "sql/rewrite/ob_transform_utils.h"
@@ -1414,6 +1415,13 @@ int ObLogJoin::check_if_disable_batch(ObLogicalOperator* root, bool &can_use_bat
       LOG_WARN("failed to check if disable batch", K(ret));
     }
   } else if (log_op_def::LOG_SET == root->get_type()) {
+    ObLogSet *log_set = static_cast<ObLogSet *>(root);
+    if (log_set->get_set_op() != ObSelectStmt::UNION) {
+      //Disable batch nested loop join that contains set operations other than UNION
+      //because other set operations may involve short-circuit operations.
+      //Currently, batch NLJ does not support short-circuit execution.
+      can_use_batch_nlj = false;
+    }
     for (int64_t i = 0; OB_SUCC(ret) && can_use_batch_nlj && i < root->get_num_of_child(); ++i) {
       ObLogicalOperator *child = root->get_child(i);
       if (OB_ISNULL(child)) {
@@ -1424,10 +1432,16 @@ int ObLogJoin::check_if_disable_batch(ObLogicalOperator* root, bool &can_use_bat
       }
     }
   } else if (log_op_def::LOG_JOIN == root->get_type()) {
-    ObLogJoin *join = NULL;
+    ObLogJoin *join = static_cast<ObLogJoin *>(root);
-    if (OB_ISNULL(join = static_cast<ObLogJoin *>(root))) {
+    ObSQLSessionInfo *session_info = NULL;
+    ObLogPlan *plan = NULL;
+    if (OB_ISNULL(plan = get_plan())
+        || OB_ISNULL(session_info = plan->get_optimizer_context().get_session_info())) {
       ret = OB_ERR_UNEXPECTED;
-      LOG_WARN("invalid input", K(ret));
+      LOG_WARN("unexpected null", K(ret), K(plan), K(session_info));
+    } else if (!session_info->is_spf_mlj_group_rescan_enabled()) {
+      //Group rescan optimization for nested joins at multiple levels is disabled by default.
+      can_use_batch_nlj = false;
     } else if (!join->can_use_batch_nlj()) {
       can_use_batch_nlj = false;
       LOG_TRACE("child join not support batch_nlj", K(root->get_name()));

src/sql/optimizer/ob_log_subplan_filter.cpp

@@ -535,17 +535,10 @@ int ObLogSubPlanFilter::check_and_set_das_group_rescan()
       || OB_ISNULL(session_info = plan->get_optimizer_context().get_session_info())) {
     ret = OB_ERR_UNEXPECTED;
     LOG_WARN("unexpected null", K(ret));
+  } else if (!session_info->is_spf_mlj_group_rescan_enabled()) {
+    enable_das_group_rescan_ = false;
   } else if (OB_FAIL(session_info->get_nlj_batching_enabled(enable_das_group_rescan_))) {
     LOG_WARN("failed to get enable batch variable", K(ret));
-  } else {
-    omt::ObTenantConfigGuard tenant_config(TENANT_CONF(session_info->get_effective_tenant_id()));
-    if (tenant_config.is_valid()) {
-      enable_das_group_rescan_ = tenant_config->_enable_spf_batch_rescan;
-      LOG_TRACE("trace disable hash groupby in second stage for three-stage",
-        K(enable_das_group_rescan_));
-    } else {
-      enable_das_group_rescan_ = false;
-    }
   }
   // check use batch
   for (int64_t i = 1; OB_SUCC(ret) && enable_das_group_rescan_ && i < get_num_of_child(); i++) {

src/sql/session/ob_sql_session_info.cpp

@@ -563,6 +563,18 @@ int ObSQLSessionInfo::is_adj_index_cost_enabled(bool &enabled, int64_t &stats_co
   return ret;
 }
 
+//to control subplan filter and multiple level join group rescan
+bool ObSQLSessionInfo::is_spf_mlj_group_rescan_enabled() const
+{
+  bool bret = false;
+  int64_t tenant_id = get_effective_tenant_id();
+  omt::ObTenantConfigGuard tenant_config(TENANT_CONF(tenant_id));
+  if (tenant_config.is_valid()) {
+    bret = tenant_config->_enable_spf_batch_rescan;
+  }
+  return bret;
+}
+
 void ObSQLSessionInfo::destroy(bool skip_sys_var)
 {
   if (is_inited_) {

src/sql/session/ob_sql_session_info.h

@@ -1192,6 +1192,7 @@ public:
   int is_enable_range_extraction_for_not_in(bool &enabled) const;
   bool is_var_assign_use_das_enabled() const;
   int is_adj_index_cost_enabled(bool &enabled, int64_t &stats_cost_percent) const;
+  bool is_spf_mlj_group_rescan_enabled() const;
 
   ObSessionDDLInfo &get_ddl_info() { return ddl_info_; }
   void set_ddl_info(const ObSessionDDLInfo &ddl_info) { ddl_info_ = ddl_info; }