fix shared hj hang because one of workers is already exited

src/sql/engine/join/ob_hash_join_op.cpp

@@ -390,6 +390,9 @@ int ObHashJoinOp::inner_open()
   ObSQLSessionInfo *session = NULL;
   if (OB_FAIL(set_shared_info())) {
     LOG_WARN("failed to set shared info", K(ret));
+  } else if (is_shared_ && OB_FAIL(sync_wait_open())) {
+    is_shared_ = false;
+    LOG_WARN("failed to sync open for shared hj", K(ret));
   } else if ((OB_UNLIKELY(MY_SPEC.all_join_keys_.count() <= 0
       || MY_SPEC.all_join_keys_.count() != MY_SPEC.all_hash_funcs_.count()
       || OB_ISNULL(left_)))) {
@@ -2392,6 +2395,25 @@ int ObHashJoinOp::sync_wait_close()
   return ret;
 }
 
+int ObHashJoinOp::sync_wait_open()
+{
+  int ret = OB_SUCCESS;
+  ObHashJoinInput *hj_input = static_cast<ObHashJoinInput*>(input_);
+  if (OB_ISNULL(hj_input)) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("unexpected status: shared hash join info is null", K(ret));
+  } else if (OB_FAIL(hj_input->sync_wait(
+      ctx_, hj_input->get_open_cnt(),
+      [&](int64_t n_times) {
+        UNUSED(n_times);
+      }))) {
+    LOG_WARN("failed to sync open", K(ret), K(spec_.id_));
+  } else {
+    LOG_TRACE("debug sync sync open", K(ret), K(spec_.id_));
+  }
+  return ret;
+}
+
 // dump partition that has only little data
 int ObHashJoinOp::dump_remain_partition()
 {

src/sql/engine/join/ob_hash_join_op.h

@@ -45,6 +45,7 @@ struct ObHashTableSharedTableInfo
 
   int64_t total_memory_row_count_;
   int64_t total_memory_size_;
+  int64_t open_cnt_;
 };
 
 class ObHashJoinInput : public ObOpInput
@@ -144,6 +145,13 @@ public:
     ObHashTableSharedTableInfo *shared_hj_info = reinterpret_cast<ObHashTableSharedTableInfo *>(shared_hj_info_);
     return shared_hj_info->close_cnt_;
   }
+
+  int64_t &get_open_cnt()
+  {
+    ObHashTableSharedTableInfo *shared_hj_info = reinterpret_cast<ObHashTableSharedTableInfo *>(shared_hj_info_);
+    return shared_hj_info->open_cnt_;
+  }
+
   ObHashTableSharedTableInfo *get_shared_hj_info()
   {
     return reinterpret_cast<ObHashTableSharedTableInfo *>(shared_hj_info_);
@@ -175,6 +183,7 @@ public:
 
       shared_hj_info->process_cnt_ = 0;
       shared_hj_info->close_cnt_ = 0;
+      shared_hj_info->open_cnt_ = 0;
       shared_hj_info->ret_ = OB_SUCCESS;
       shared_hj_info->read_null_in_naaj_ = false;
       new (&shared_hj_info->cond_)common::SimpleCond(common::ObWaitEventIds::SQL_SHARED_HJ_COND_WAIT);
@@ -946,6 +955,7 @@ private:
   int sync_set_early_exit();
   int do_sync_wait_all();
   int sync_wait_close();
+  int sync_wait_open();
   /********** end for shared hash table hash join *******/
 private:
   using PredFunc = std::function<bool(int64_t)>;