shorten improve comment

crates/polars-io/src/parquet/read_impl.rs

@@ -671,8 +671,6 @@ impl BatchedParquetReader {
                     let use_statistics = self.use_statistics;
                     let hive_partition_columns = self.hive_partition_columns.clone();
 
-                    // This is a synchronous blocking operation so we run it in a way
-                    // that makes sure we don't block the polling of async tasks.
                     let f = move || {
                         let dfs = rg_to_dfs(
                             &store,
@@ -692,15 +690,16 @@ impl BatchedParquetReader {
                         tx.send((dfs, rows_read, limit)).unwrap();
                     };
 
+                    // Spawn the task and wait on it asynchronously.
                     let (dfs, rows_read, limit) = if POOL.current_thread_index().is_some() {
-                        // We are a rayon thread, so we must actively participate in driving rayon tasks, thus we use POOL.install.
-                        // Using POOL.spawn as a rayon thread essentially means that a rayon thread is spawning a task that it refuses to run,
-                        // and if every rayon thread did this then we would deadlock.
-                        //
-                        // POOL.install blocks the current thread, so we activate another tokio thread using tokio::spawn.
-                        // This (should) ensure that futures continue to be polled in a timely manner, since the new
-                        // tokio thread would be able to work-steal async tasks from threads that are blocking for too long.
+                        // We are a rayon thread, so we can't use POOL.spawn as it would mean we spawn a task and block until
+                        // another rayon thread executes it - we would deadlock if all rayon threads did this.
+
+                        // Activate another tokio thread to poll futures. There should be at least 1 tokio thread that is
+                        // not a rayon thread.
                         let handle = tokio::spawn(async { rx.await.unwrap() });
+                        // Now spawn the task onto rayon and participate in executing it. The current thread will no longer
+                        // poll async futures until this rayon task is complete.
                         POOL.install(f);
                         handle.await.unwrap()
                     } else {