irenjj commented on code in PR #15140:
URL: https://github.com/apache/datafusion/pull/15140#discussion_r1989258369
##########
datafusion/physical-plan/src/sorts/sort_preserving_merge.rs:
##########
@@ -186,8 +186,15 @@ impl DisplayAs for SortPreservingMergeExec {
Ok(())
}
DisplayFormatType::TreeRender => {
- // TODO: collect info
- write!(f, "")
+ for (i, e) in self.expr().iter().enumerate() {
+ let e = e.to_string();
+ writeln!(f, "expr{i}={e}")?;
+ }
Review Comment:
In the latest version(#15125), we are no longer limited to using KV to
represent each line of output, maybe we can print sorted keys without the
prefix `expr:` like:
```
date@0 ASC NULLS LAST,time@2 ASC NULLS LAST,...
```
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