alamb commented on code in PR #17115:
URL: https://github.com/apache/datafusion/pull/17115#discussion_r2270694158


##########
datafusion/physical-plan/src/sorts/merge.rs:
##########
@@ -49,7 +49,8 @@ pub(crate) struct SortPreservingMergeStream<C: CursorValues> {
     /// used to record execution metrics
     metrics: BaselineMetrics,
 
-    /// If the stream has encountered an error
+    /// If the stream has encountered an error or reaches the

Review Comment:
   🤔 
   
   It seems like DataFusion already uses several different conventions (none of 
them are `completed` or `exhausted`)
   - `input_done`: 
https://github.com/apache/datafusion/blob/5421825b62a4bbb977cb91ac45152b3a14ef3e88/datafusion/physical-plan/src/aggregates/row_hash.rs#L388-L387
   - `done`: 
https://github.com/apache/datafusion/blob/0f83c1d233499e80fd9b0baf89dd624099c1d1ba/datafusion/core/tests/user_defined/user_defined_plan.rs#L763-L762
   - `finished` (in 4 places): 
https://github.com/apache/datafusion/blob/9278233e9fe34f7712370f2fa583ba94663a0678/datafusion/physical-plan/src/aggregates/no_grouping.rs#L64-L63
   
   Perhaps we can improve the name and maybe make them more consistent as a 
follow on PR



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