xudong963 commented on code in PR #15503:
URL: https://github.com/apache/datafusion/pull/15503#discussion_r2031009946
##########
datafusion/datasource/src/source.rs:
##########
@@ -175,6 +175,23 @@ impl ExecutionPlan for DataSourceExec {
self.data_source.statistics()
}
+ fn statistics_by_partition(&self) ->
datafusion_common::Result<Vec<Statistics>> {
+ let mut statistics = vec![
+ Statistics::new_unknown(&self.schema());
+ self.properties().partitioning.partition_count()
+ ];
+ if let Some(file_config) =
+ self.data_source.as_any().downcast_ref::<FileScanConfig>()
+ {
+ for (idx, file_group) in
file_config.file_groups.iter().enumerate() {
+ if let Some(stat) = file_group.statistics() {
+ statistics[idx] = stat.clone();
Review Comment:
> we can utilize `PlanProperties`? The Statistics will be initiated once and
cached like other planning properties
I've had a general look at it and it should work.
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