fix: make the stats more reasonable and clear (#928)

Author: georgeh0

src/execution/row_indexer.rs

@@ -369,12 +369,10 @@ impl<'a> RowIndexer<'a> {
 
         if let Some(existing_version) = existing_version {
             if output.is_some() {
-                if !source_version.ordinal.is_available()
-                    || source_version.ordinal != existing_version.ordinal
-                {
-                    self.update_stats.num_updates.inc(1);
-                } else {
+                if existing_version.kind == SourceVersionKind::DifferentLogic {
                     self.update_stats.num_reprocesses.inc(1);
+                } else {
+                    self.update_stats.num_updates.inc(1);
                 }
             } else {
                 self.update_stats.num_deletions.inc(1);

src/execution/stats.rs

@@ -115,8 +115,24 @@ impl std::fmt::Display for UpdateStats {
         let num_reprocesses = self.num_reprocesses.get();
         let num_source_rows = num_insertions + num_deletions + num_updates + num_reprocesses;
         if num_source_rows > 0 {
+            let mut sub_messages = Vec::new();
+            if num_insertions > 0 {
+                sub_messages.push(format!("{num_insertions} ADDED"));
+            }
+            if num_deletions > 0 {
+                sub_messages.push(format!("{num_deletions} REMOVED"));
+            }
+            if num_reprocesses > 0 {
+                sub_messages.push(format!(
+                    "{num_reprocesses} REPROCESSED due to flow or logic changes"
+                ));
+            }
+            if num_updates > 0 {
+                sub_messages.push(format!("{num_updates} UPDATED in source content"));
+            }
             messages.push(format!(
-                "{num_source_rows} source rows processed ({num_insertions} ADDED, {num_deletions} REMOVED, {num_updates} UPDATED, {num_reprocesses} REPROCESSED on flow or logic changes)",
+                "{num_source_rows} source rows processed ({})",
+                sub_messages.join(", "),
             ));
         }