geoffreyclaude commented on code in PR #19443:
URL: https://github.com/apache/datafusion/pull/19443#discussion_r2640928238


##########
datafusion/physical-expr/src/expressions/in_list.rs:
##########
@@ -3225,4 +3226,242 @@ mod tests {
 
         Ok(())
     }
+
+    #[test]
+    fn test_in_list_esoteric_types() -> Result<()> {
+        // Test esoteric/less common types to validate the transform and 
mapping flow.
+        // These types are reinterpreted to base primitive types (e.g., 
Timestamp -> UInt64,
+        // Interval -> Decimal128, Float16 -> UInt16). We just need to verify 
basic
+        // functionality works - no need for comprehensive null handling tests.
+
+        // Helper: simple IN test that expects [Some(true), Some(false)]
+        let test_type = |data_type: DataType,
+                         in_array: ArrayRef,
+                         list_values: Vec<ScalarValue>|
+         -> Result<()> {
+            let schema = Schema::new(vec![Field::new("a", data_type.clone(), 
false)]);
+            let col_a = col("a", &schema)?;
+            let batch = RecordBatch::try_new(Arc::new(schema.clone()), 
vec![in_array])?;
+
+            let list = list_values.into_iter().map(lit).collect();
+            in_list!(
+                batch,
+                list,
+                &false,
+                vec![Some(true), Some(false)],
+                col_a,
+                &schema
+            );
+            Ok(())
+        };
+
+        // Timestamp types (all units map to Int64 -> UInt64)
+        test_type(
+            DataType::Timestamp(TimeUnit::Second, None),
+            Arc::new(TimestampSecondArray::from(vec![Some(1000), Some(2000)])),
+            vec![
+                ScalarValue::TimestampSecond(Some(1000), None),
+                ScalarValue::TimestampSecond(Some(1500), None),
+            ],
+        )?;
+
+        test_type(
+            DataType::Timestamp(TimeUnit::Millisecond, None),
+            Arc::new(TimestampMillisecondArray::from(vec![
+                Some(1000000),
+                Some(2000000),
+            ])),
+            vec![
+                ScalarValue::TimestampMillisecond(Some(1000000), None),
+                ScalarValue::TimestampMillisecond(Some(1500000), None),

Review Comment:
   Added in new commit



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