alamb commented on code in PR #13187:
URL: https://github.com/apache/datafusion/pull/13187#discussion_r1826260061
##########
datafusion/physical-plan/src/joins/hash_join.rs:
##########
@@ -780,24 +780,15 @@ impl ExecutionPlan for HashJoinExec {
// TODO stats: it is not possible in general to know the output size
of joins
// There are some special cases though, for example:
// - `A LEFT JOIN B ON A.col=B.col` with
`COUNT_DISTINCT(B.col)=COUNT(B.col)`
- let mut stats = estimate_join_statistics(
+ let stats = estimate_join_statistics(
Arc::clone(&self.left),
Arc::clone(&self.right),
self.on.clone(),
&self.join_type,
&self.join_schema,
)?;
// Project statistics if there is a projection
- if let Some(projection) = &self.projection {
- stats.column_statistics = stats
Review Comment:
this code also appears to assume projections never contain repeated values 🤔
I can try and improve the statistics calculation in a future PR to avoid
cloning
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