Dandandan commented on code in PR #21240:
URL: https://github.com/apache/datafusion/pull/21240#discussion_r3011728198
##########
datafusion/physical-plan/src/scalar_subquery.rs:
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@@ -237,6 +237,10 @@ impl ExecutionPlan for ScalarSubqueryExec {
self.true_for_input_only()
}
+ fn partition_statistics(&self, partition: Option<usize>) ->
Result<Arc<Statistics>> {
+ self.input.partition_statistics(partition)
Review Comment:
The idea is mostly that the subquery will have either unknown or high
estimated stats, returning updated stats for a *scalar* subquery should
generally be much more effective for planning correct join order, as it can be
loaded in the build side.
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