rdettai commented on a change in pull request #965:
URL: https://github.com/apache/arrow-datafusion/pull/965#discussion_r706817941
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File path: datafusion/src/physical_plan/mod.rs
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@@ -89,6 +89,34 @@ impl Stream for EmptyRecordBatchStream {
/// Physical planner interface
pub use self::planner::PhysicalPlanner;
+/// Statistics for an physical plan node
Review comment:
Agreed! I plan to make a separate PR to also allow physical expressions
to propagate statistics (see #992). That will probably be the right moment to
refactor this.
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