pitrou commented on issue #34509:
URL: https://github.com/apache/arrow/issues/34509#issuecomment-1623615380
The silly thing is that `FileReaderImpl::GetRecordBatchGenerator` seems to
read one table per row group and then slices that table in batch-size'd record
batches. @lidavidm Do you remember why is that?
```c++
const int64_t batch_size = self->properties().batch_size();
return self->DecodeRowGroups(self, {row_group}, column_indices,
cpu_executor)
.Then([batch_size](const std::shared_ptr<Table>& table)
-> ::arrow::Result<RecordBatchGenerator> {
::arrow::TableBatchReader table_reader(*table);
table_reader.set_chunksize(batch_size);
ARROW_ASSIGN_OR_RAISE(auto batches,
table_reader.ToRecordBatches());
return ::arrow::MakeVectorGenerator(std::move(batches));
});
```
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