kou commented on code in PR #37970:
URL: https://github.com/apache/arrow/pull/37970#discussion_r1344878886
##########
cpp/src/arrow/ipc/reader.h:
##########
@@ -425,6 +425,37 @@ class ARROW_EXPORT StreamDecoder {
/// \return Status
Status Consume(std::shared_ptr<Buffer> buffer);
+ /// \brief Reset the internal status.
+ ///
+ /// You can reuse this decoder for new stream after calling
+ /// this. For example, you can implement endless decoder with this:
Review Comment:
OK. I'll remove this example.
See #37429 for a use case of the endless decoder. It reads multiple streams
with one decoder instance.
FYI: We can implement the use case by using `next_required_size()` instead
but we need to recreate decoder instances manually:
```cpp
while (true) {
auto buffer = get_data(decoder->next_required_size());
if (!buffer) {
break;
}
decoder->Consume(buffer);
if (listener->status() == EOS) {
decoder = create_decoder(listener);
}
}
```
##########
cpp/src/arrow/ipc/reader.cc:
##########
@@ -2032,6 +2036,11 @@ Status StreamDecoder::Consume(const uint8_t* data,
int64_t size) {
Status StreamDecoder::Consume(std::shared_ptr<Buffer> buffer) {
return impl_->Consume(std::move(buffer));
}
+Status StreamDecoder::Reset() {
+ impl_ =
+ std::make_unique<StreamDecoderImpl>(std::move(impl_->listener()),
impl_->options());
Review Comment:
Oh, sorry. I'll remove it.
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