[GitHub] [arrow] westonpace commented on a change in pull request #12720: ARROW-15994: [C++] Back out taskify changes

[GitBox <gi...@apache.org>]

westonpace commented on a change in pull request #12720:
URL: https://github.com/apache/arrow/pull/12720#discussion_r836868243



##########
File path: cpp/src/arrow/compute/exec/exec_plan.cc
##########
@@ -436,22 +436,11 @@ void MapNode::SubmitTask(std::function<Result<ExecBatch>(ExecBatch)> map_fn,
     return Status::OK();
   };
 
-  if (executor_) {
-    status = task_group_.AddTask([this, task]() -> Result<Future<>> {
-      return this->executor_->Submit(this->stop_source_.token(), [this, task]() {
-        auto status = task();
-        if (this->input_counter_.Increment()) {
-          this->Finish(status);
-        }
-        return status;
-      });
-    });
-  } else {
-    status = task();
-    if (input_counter_.Increment()) {
-      this->Finish(status);
-    }
+  status = task();
+  if (input_counter_.Increment()) {

Review comment:
       I think it's slightly clearer to readers if this check comes after the `if (!status.ok())` check.  Then we can just do...
   
   ```
   if (input_counter_.Increment()) {
     this->Finish();
   }
   ```

##########
File path: cpp/src/arrow/compute/exec/exec_plan.cc
##########
@@ -436,22 +436,11 @@ void MapNode::SubmitTask(std::function<Result<ExecBatch>(ExecBatch)> map_fn,
     return Status::OK();
   };
 
-  if (executor_) {
-    status = task_group_.AddTask([this, task]() -> Result<Future<>> {
-      return this->executor_->Submit(this->stop_source_.token(), [this, task]() {
-        auto status = task();
-        if (this->input_counter_.Increment()) {
-          this->Finish(status);
-        }
-        return status;
-      });
-    });
-  } else {
-    status = task();
-    if (input_counter_.Increment()) {
-      this->Finish(status);
-    }
+  status = task();
+  if (input_counter_.Increment()) {
+    this->Finish(status);
   }
+
   // If we get a cancelled status from AddTask it means this node was stopped
   // or errored out already so we can just drop the task.
   if (!status.ok() && !status.IsCancelled()) {

Review comment:
       We don't need the comment (or the check for `!status.IsCancelled`) anymore.




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