fix

Author: HuXin0817

src/observer/sql/operator/table_scan_physical_operator.h

@@ -32,14 +32,24 @@ class Table;
 class TableScanPhysicalOperator : public PhysicalOperator
 {
 public:
-  TableScanPhysicalOperator(Table *table, ReadWriteMode mode) : table_(table), mode_(mode) {}
+  TableScanPhysicalOperator(Table *table, ReadWriteMode mode) : table_(table), mode_(mode)
+  {
+    record_scanner_ = new RecordFileScanner();
+  }
 
   TableScanPhysicalOperator(Table *table, std::string alias, ReadWriteMode mode) : table_(table), mode_(mode)
   {
+    record_scanner_ = new RecordFileScanner();
     tuple_.set_table_alias(alias);
   }
 
-  ~TableScanPhysicalOperator() override = default;
+  ~TableScanPhysicalOperator() override
+  {
+    if (record_scanner_ != nullptr) {
+      delete record_scanner_;
+      record_scanner_ = nullptr;
+    }
+  }
 
   string param() const override;