zeroshade commented on code in PR #40807:
URL: https://github.com/apache/arrow/pull/40807#discussion_r1541325263
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cpp/src/arrow/record_batch.h:
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@@ -254,6 +255,16 @@ class ARROW_EXPORT RecordBatch {
/// \return Status
virtual Status ValidateFull() const;
+ /// \brief Return a top-level sync event object for this record batch
+ ///
+ /// If all of the data for this record batch is in host memory, then this
+ /// should return null (the default impl). If the data for this batch is
+ /// on a device, then if synchronization is needed before accessing the
+ /// data the returned sync event will allow for it.
+ ///
+ /// \return null or a Device::SyncEvent
+ virtual std::shared_ptr<Device::SyncEvent> GetSyncEvent();
Review Comment:
technically, the `SyncEvent` is held at the buffer levels currently (and
should be the same pointer for each relevant buffer). A record batch which can
return the sync event should be somehow tied to all of its columns (ideally the
same event for all the columns)
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