mpimenov commented on issue #40068:
URL: https://github.com/apache/arrow/issues/40068#issuecomment-1944285079
Dataset creation itself looks quite vanilla to me
```
std::vector<std::string> paths = FillPaths();
arrow::dataset::FileSystemFactoryOptions options;
options.partitioning = arrow::dataset::HivePartitioning::MakeFactory();
options.partition_base_dir = root_path;
options.exclude_invalid_files = true;
return arrow::dataset::FileSystemDatasetFactory::Make(
std::make_shared<arrow::fs::LocalFileSystem>(),
paths,
std::make_shared<arrow::dataset::ParquetFileFormat>(),
options
)
.ValueOrDie()
->Finish()
.ValueOrDie();
```
However, when reading it I do this (for filtering columns and such)
```
arrow::dataset::internal::Initialize();
std::vector<std::shared_ptr<arrow::Field>> fields;
for (const auto& i : dataset->schema()->fields()) {
if (options.fields_.empty() || contains(options.fields_, i->name())) {
fields.push_back(i);
}
}
dataset = dataset->ReplaceSchema(std::make_shared<arrow::Schema>(fields,
dataset->schema()->metadata())).ValueOrDie();
```
I don't know if this is idiomatic enough
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