lidavidm commented on a change in pull request #9656:
URL: https://github.com/apache/arrow/pull/9656#discussion_r606279919
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File path: cpp/src/arrow/ipc/reader.cc
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@@ -1022,7 +1111,24 @@ class RecordBatchFileReaderImpl : public
RecordBatchFileReader {
ReadStats stats() const override { return stats_; }
+ Result<AsyncGenerator<std::shared_ptr<RecordBatch>>> GetRecordBatchGenerator(
+ int readahead_messages, const io::IOContext& io_context,
+ arrow::internal::Executor* executor) override {
+ auto state =
std::dynamic_pointer_cast<RecordBatchFileReaderImpl>(shared_from_this());
+ auto message_generator = MakeMessageGenerator(state, io_context);
+ if (readahead_messages > 0) {
+ message_generator = MakeReadaheadGenerator(message_generator,
readahead_messages);
+ }
+ return IpcFileRecordBatchGenerator(
+ std::move(state), std::move(message_generator),
+ executor ? executor : arrow::internal::GetCpuThreadPool());
Review comment:
Well, scratch that - I messed up my Git commands and so the above only
benchmarks the effect of fewer I/O operations. I'll also test not transferring…
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