gene-bordegaray commented on code in PR #22657:
URL: https://github.com/apache/datafusion/pull/22657#discussion_r3456320507
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datafusion/datasource/src/file_scan_config/mod.rs:
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@@ -700,56 +773,55 @@ impl DataSource for FileScanConfig {
Ok(source.map(|s| Arc::new(s) as _))
}
- /// Returns the output partitioning for this file scan.
+ /// Returns declared or derived output partitioning for this file scan.
///
- /// When `partitioned_by_file_group` is true, this returns
`Partitioning::Hash` on
- /// the Hive partition columns, allowing the optimizer to skip hash
repartitioning
- /// for aggregates and joins on those columns.
+ /// Declared partitioning is projected through the scan projection. If it
+ /// cannot be projected, or its partition count differs from `file_groups`,
+ /// this returns `UnknownPartitioning`.
///
- /// Tradeoffs
Review Comment:
actually if we are deprecating `partitioned_by_file_group` I will keep this
and omit that new addition 👍
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