tustvold commented on code in PR #6183:
URL: https://github.com/apache/arrow-datafusion/pull/6183#discussion_r1181715419
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datafusion/core/src/datasource/listing/helpers.rs:
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@@ -152,225 +146,224 @@ pub fn split_files(
.collect()
}
+struct Partition {
+ path: Path,
+ depth: usize,
+ files: Option<Vec<ObjectMeta>>,
+}
+
+impl Partition {
+ async fn list(mut self, store: &dyn ObjectStore) -> Result<(Self,
Vec<Path>)> {
+ let prefix = Some(&self.path).filter(|p| !p.as_ref().is_empty());
+ let result = store.list_with_delimiter(prefix).await?;
+ self.files = Some(result.objects);
+ Ok((self, result.common_prefixes))
+ }
+}
+
+/// Returns a recursive list of the partitions in `table_path` up to
`max_depth`
+async fn list_partitions(
+ store: &dyn ObjectStore,
+ table_path: &ListingTableUrl,
+ max_depth: usize,
+) -> Result<Vec<Partition>> {
+ let partition = Partition {
+ path: table_path.prefix().clone(),
+ depth: 0,
+ files: None,
+ };
+
+ let mut out = Vec::with_capacity(64);
+ let mut futures = FuturesUnordered::new();
+ futures.push(partition.list(store));
+
+ while let Some((partition, paths)) = futures.next().await.transpose()? {
+ let depth = partition.depth;
+ out.push(partition);
+ for path in paths {
+ let child = Partition {
+ path,
+ depth: depth + 1,
+ files: None,
+ };
+ match depth < max_depth {
+ true => futures.push(child.list(store)),
+ false => out.push(child),
+ }
+ }
+ }
+ Ok(out)
+}
+
+async fn prune_partitions(
+ table_path: &ListingTableUrl,
+ partitions: Vec<Partition>,
+ filters: &[Expr],
+ partition_cols: &[(String, DataType)],
+) -> Result<Vec<Partition>> {
+ if filters.is_empty() {
+ return Ok(partitions);
+ }
+
+ let mut builders: Vec<_> = (0..partition_cols.len())
+ .map(|_| StringBuilder::with_capacity(partitions.len(),
partitions.len() * 10))
+ .collect();
+
+ for partition in &partitions {
+ let cols = partition_cols.iter().map(|x| x.0.as_str());
+ let parsed = parse_partitions_for_path(&table_path, &partition.path,
cols)
+ .unwrap_or_default();
+
+ let mut builders = builders.iter_mut();
+ for (p, b) in parsed.iter().zip(&mut builders) {
+ b.append_value(p);
+ }
+ builders.for_each(|b| b.append_null());
+ }
+
+ let arrays = partition_cols
+ .iter()
+ .zip(builders)
+ .map(|((_, d), mut builder)| {
+ let array = builder.finish();
+ cast(&array, d)
+ })
+ .collect::<Result<_, _>>()?;
+
+ let fields: Fields = partition_cols
+ .into_iter()
+ .map(|(n, d)| Field::new(n, d.clone(), true))
+ .collect();
+ let schema = Arc::new(Schema::new(fields));
+
+ let df_schema = DFSchema::new_with_metadata(
+ partition_cols
+ .into_iter()
+ .map(|(n, d)| DFField::new_unqualified(n, d.clone(), true))
+ .collect(),
+ Default::default(),
+ )?;
+
+ let batch = RecordBatch::try_new(schema.clone(), arrays)?;
+
+ // TODO: Plumb this down
Review Comment:
This was a pre-existing issue
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