kumarUjjawal commented on code in PR #24781:
URL: https://github.com/apache/datafusion/pull/24781#discussion_r3921339965


##########
datafusion/pruning/src/string_in_list.rs:
##########
@@ -151,19 +184,46 @@ impl PhysicalExpr for StringInListPruningExpr {
                         // uses actual Arrow partition values. 
PrunableStatistics
                         // trusts file providers' bounds: there is no ordering 
gate
                         // for arbitrary statistics providers here.
-                        let index = self.values.partition_point(|v| 
v.as_bytes() < min);
-                        Some(self.values.get(index).is_some_and(|v| 
v.as_bytes() <= max))
+                        match self.membership {
+                            SetMembership::In => {
+                                let index =
+                                    self.values.partition_point(|v| 
v.as_bytes() < min);
+                                Some(
+                                    self.values
+                                        .get(index)
+                                        .is_some_and(|v| v.as_bytes() <= max),
+                                )
+                            }
+                            // A wider interval can always hold a value 
outside the
+                            // domain, which satisfies NOT IN. Only an interval
+                            // pinned to one domain value rules out every row.
+                            // Truncated Parquet bounds cannot fake that: min
+                            // truncates downward and max upward, so equal 
bounds

Review Comment:
   done!



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