revert 'Reset PX DataHub whole msg in rescan scenario'

src/sql/engine/px/datahub/components/ob_dh_range_dist_wf.cpp

@@ -298,8 +298,6 @@ int ObRDWFPieceMsgCtx::send_whole_msg(common::ObIArray<ObPxSqcMeta *> &sqcs)
 void ObRDWFPieceMsgCtx::reset_resource()
 {
   received_ = 0;
-  infos_.reset();
-  arena_alloc_.reset();
 }
 
 int ObRDWFWholeMsg::assign(const ObRDWFWholeMsg &msg)

src/sql/engine/px/datahub/ob_dh_msg_provider.h

@@ -25,26 +25,20 @@ namespace sql
 class ObPxDatahubDataProvider
 {
 public:
-  ObPxDatahubDataProvider()
-      : op_id_(-1), msg_type_(dtl::TESTING), send_msg_cnt_(0), msg_set_(false)
-  {
-  }
   virtual int get_msg_nonblock(const dtl::ObDtlMsg *&msg, int64_t timeout_ts) = 0;
-  virtual void reset() { msg_set_ = false; }
+  virtual void reset() {}
   TO_STRING_KV(K_(op_id), K_(msg_type));
   uint64_t op_id_; // 注册本 provider 的算子 id，用于 provder 数组里寻址对应 provider
   dtl::ObDtlMsgType msg_type_;
-  volatile int64_t send_msg_cnt_;
-  bool msg_set_;
 };
 
 template <typename T>
 class ObWholeMsgProvider : public ObPxDatahubDataProvider
 {
 public:
-  ObWholeMsgProvider() {}
+  ObWholeMsgProvider() : msg_set_(false) {}
   virtual ~ObWholeMsgProvider() = default;
-  virtual void reset() override { msg_.reset(); ObPxDatahubDataProvider::reset(); }
+  virtual void reset() override { msg_.reset(); msg_set_ = false; }
   int get_msg_nonblock(const dtl::ObDtlMsg *&msg, int64_t timeout_ts)
   {
     int ret = OB_SUCCESS;
@@ -89,6 +83,7 @@ private:
     return ret;
   }
 private:
+  bool msg_set_;
   T msg_;
   common::ObThreadCond msg_ready_cond_;
 };

src/sql/engine/px/ob_px_sqc_proxy.h

@@ -225,19 +225,6 @@ int ObPxSQCProxy::get_dh_msg(
         SQL_LOG(WARN, "fail push data to channel", K(ret));
       } else if (OB_FAIL(ch->flush())) {
         SQL_LOG(WARN, "fail flush dtl data", K(ret));
-      } else {
-        // The whole message should be reset in next rescan, we reset it after last piece msg
-        // send in sending piece msg and receiving whole msg scenario (need send && wait whole msg).
-        if (need_wait_whole_msg) {
-          const int64_t task_cnt = get_task_count();
-          if (provider->send_msg_cnt_ % task_cnt == 0) {
-            provider->msg_set_ = false;
-          }
-          provider->send_msg_cnt_ += 1;
-          if (provider->send_msg_cnt_ % task_cnt == 0) {
-            provider->reset(); // reset whole message
-          }
-        }
       }
     }