Add defensive checks to group scan scenarios

src/sql/das/ob_das_group_scan_op.cpp

@@ -30,6 +30,14 @@ ObDASGroupScanOp::ObDASGroupScanOp(ObIAllocator &op_alloc)
 {
 }
 
+ObDASGroupScanOp::~ObDASGroupScanOp()
+{
+  if (result_iter_ != nullptr && result_iter_->get_type() == ObNewRowIterator::ObTableScanIterator) {
+    LOG_ERROR("table group scan iter is not released, maybe some bug occured",
+              KPC(scan_ctdef_), K(scan_param_), KPC(scan_rtdef_));
+  }
+}
+
 int ObDASGroupScanOp::rescan()
 {
   int &ret = errcode_;
@@ -223,6 +231,21 @@ int ObDASGroupScanOp::decode_task_result(ObIDASTaskResult *task_result)
   }
   return ret;
 }
+ObGroupLookupOp::~ObGroupLookupOp()
+{
+  const ObNewRowIterator *lookup_iter = get_lookup_storage_iter();
+  if (lookup_iter != nullptr && lookup_iter->get_type() == ObNewRowIterator::ObTableScanIterator) {
+    LOG_ERROR("lookup_iter iter is not released, maybe some bug occured",
+              KPC(lookup_ctdef_), K(scan_param_), KPC(index_ctdef_),
+              K(lookup_rowkey_cnt_), K(lookup_row_cnt_));
+  }
+  const ObNewRowIterator *rowkey_iter = static_cast<ObGroupScanIter *>(get_rowkey_iter())->get_iter();
+  if (rowkey_iter != nullptr && rowkey_iter->get_type() == ObNewRowIterator::ObTableScanIterator) {
+    LOG_ERROR("rowkey_iter iter is not released, maybe some bug occured",
+              KPC(lookup_ctdef_), K(scan_param_), KPC(index_ctdef_),
+              K(lookup_rowkey_cnt_), K(lookup_row_cnt_));
+  }
+}
 
 int ObGroupLookupOp::init_group_range(int64_t cur_group_idx, int64_t group_size)
 {

src/sql/das/ob_das_group_scan_op.h

@@ -25,6 +25,7 @@ public:
                       index_group_cnt_(1),
                       lookup_group_cnt_(1)
   {}
+  virtual ~ObGroupLookupOp();
   virtual void reset() override
   {
     ObLocalIndexLookupOp::reset();
@@ -57,6 +58,7 @@ class ObDASGroupScanOp : public ObDASScanOp
   OB_UNIS_VERSION(1);
 public:
   ObDASGroupScanOp(common::ObIAllocator &op_alloc);
+  virtual ~ObDASGroupScanOp();
   int open_op() override;
   int release_op() override;
   virtual int rescan() override;