Ruchirtripathi commented on code in PR #25099:
URL: https://github.com/apache/datafusion/pull/25099#discussion_r3971629159


##########
datafusion/expr-common/src/casts.rs:
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@@ -998,6 +1013,26 @@ mod tests {
         assert!(is_lossy_temporal_cast(&ts, &DataType::Date32));
     }
 
+    #[test]
+    fn test_is_lossy_temporal_cast_timestamp_tz() {

Review Comment:
   Done! I've added all of these queries to 
datafusion/sqllogictest/test_files/datetime/timestamps.slt. I also added the 
two extra test cases (the symmetric guard check and the EXPLAIN block for the 
UTC session timezone) to ensure the optimization is still applied correctly 
when the offset is exactly zero.



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