Remove useless "hash table ready" states in swiss join

cpp/src/arrow/acero/swiss_join.cc

@@ -2462,7 +2462,6 @@ class SwissJoin : public HashJoinImpl {
     output_batch_callback_ = std::move(output_batch_callback);
     finished_callback_ = std::move(finished_callback);
 
-    hash_table_ready_.store(false);
     cancelled_.store(false);
     {
       std::lock_guard<std::mutex> lock(state_mutex_);
@@ -2474,7 +2473,6 @@ class SwissJoin : public HashJoinImpl {
     local_states_.resize(num_threads_);
     for (int i = 0; i < num_threads_; ++i) {
       RETURN_NOT_OK(local_states_[i].stack.Init(pool_, kTempStackUsage));
-      local_states_[i].hash_table_ready = false;
       local_states_[i].num_output_batches = 0;
       local_states_[i].materialize.Init(pool_, proj_map_left, proj_map_right);
     }
@@ -2520,11 +2518,6 @@ class SwissJoin : public HashJoinImpl {
       return status();
     }
 
-    if (!local_states_[thread_index].hash_table_ready) {
-      local_states_[thread_index].hash_table_ready = hash_table_ready_.load();
-    }
-    ARROW_DCHECK(local_states_[thread_index].hash_table_ready);
-
     ExecBatch keypayload_batch;
     ARROW_ASSIGN_OR_RAISE(keypayload_batch, KeyPayloadFromInput(/*side=*/0, &batch));
     arrow::util::TempVectorStack* temp_stack = &local_states_[thread_index].stack;
@@ -2689,7 +2682,6 @@ class SwissJoin : public HashJoinImpl {
                                                 hash_table_.payloads(),
                                                 hash_table_.key_to_payload() == nullptr);
     }
-    hash_table_ready_.store(true);
 
     residual_filter_.OnBuildFinished();
 
@@ -2910,7 +2902,6 @@ class SwissJoin : public HashJoinImpl {
     JoinResultMaterialize materialize;
     std::vector<KeyColumnArray> temp_column_arrays;
     int64_t num_output_batches;
-    bool hash_table_ready;
   };
   std::vector<ThreadLocalState> local_states_;
 
@@ -2927,7 +2918,6 @@ class SwissJoin : public HashJoinImpl {
   // The other flags that follow them, protected by mutex, will be queried or
   // updated only a fixed number of times during entire join processing.
   //
-  std::atomic<bool> hash_table_ready_;
   std::atomic<bool> cancelled_;
 
   // Mutex protecting state flags.