[to #47336750] fix memory leak of package variable serialize

src/pl/ob_pl_package_manager.cpp

@@ -758,7 +758,7 @@ int ObPLPackageManager::set_package_var_val(const ObPLResolveCtx &resolve_ctx,
     ret = OB_ERR_NUMERIC_OR_VALUE_ERROR;
     LOG_WARN("not null check violated", K(var->is_not_null()), K(var_val.is_null()), K(ret));
   }
-  OZ (package_state->set_package_var_val(var_idx, new_var_val));
+  OZ (package_state->set_package_var_val(var_idx, new_var_val, !need_deserialize));
   if (!need_deserialize) {
     OZ (package_state->update_changed_vars(var_idx));
   }

src/pl/ob_pl_package_state.cpp

@@ -183,7 +183,7 @@ void ObPLPackageState::reset(ObSQLSessionInfo *session_info)
   cursor_allocator_.reset();
 }
 
-int ObPLPackageState::set_package_var_val(const int64_t var_idx, const ObObj &value)
+int ObPLPackageState::set_package_var_val(const int64_t var_idx, const ObObj &value, bool deep_copy_complex)
 {
   int ret = OB_SUCCESS;
   if (var_idx < 0 || var_idx >= vars_.count()) {
@@ -199,7 +199,10 @@ int ObPLPackageState::set_package_var_val(const int64_t var_idx, const ObObj &va
         LOG_WARN("failed to alloc memory for pacakge var", K(ret), K(buf));
       }
       OZ (vars_.at(var_idx).deep_copy(value, buf, value.get_deep_copy_size(), pos));
-    } else if (value.is_pl_extend()) {
+    } else if (value.is_pl_extend()
+               && value.get_meta().get_extend_type() != PL_CURSOR_TYPE
+               && value.get_meta().get_extend_type() != PL_REF_CURSOR_TYPE
+               && deep_copy_complex) {
       ObObj copy;
       OZ (ObUserDefinedType::deep_copy_obj(inner_allocator_, value, copy));
       OX (vars_.at(var_idx) = copy);

src/pl/ob_pl_package_state.h

@@ -134,7 +134,7 @@ public:
   common::ObIAllocator &get_pkg_allocator() { return inner_allocator_; }
   common::ObIAllocator &get_pkg_cursor_allocator() { return cursor_allocator_; }
   int add_package_var_val(const common::ObObj &value, ObPLType type);
-  int set_package_var_val(int64_t var_idx, const common::ObObj &value);
+  int set_package_var_val(int64_t var_idx, const common::ObObj &value, bool deep_copy_complex = true);
   int get_package_var_val(int64_t var_idx, common::ObObj &value);
   int update_changed_vars(int64_t var_idx);
   inline bool is_package_info_changed()