lidavidm commented on a change in pull request #10124:
URL: https://github.com/apache/arrow/pull/10124#discussion_r617735268
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File path: cpp/src/arrow/dataset/scanner_test.cc
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@@ -319,6 +322,23 @@ class FailingFragment : public InMemoryFragment {
return std::make_shared<InMemoryScanTask>(batches, options, self);
});
}
+
+ Result<RecordBatchGenerator> ScanBatchesAsync(
+ const std::shared_ptr<ScanOptions>& options) override {
+ struct {
+ Future<std::shared_ptr<RecordBatch>> operator()() {
+ if (index > 16) {
+ return Status::Invalid("Oh no, we failed!");
+ }
+ auto batch = batches[index++ % batches.size()];
+ return Future<std::shared_ptr<RecordBatch>>::MakeFinished(batch);
+ }
+ RecordBatchVector batches;
+ int index = 0;
+ } Generator;
Review comment:
Yup, it's used quite a bit in the datasets implementation (e.g. see
ParquetScanTask in file_parquet.cc).
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