korowa commented on code in PR #14232:
URL: https://github.com/apache/datafusion/pull/14232#discussion_r1929797759


##########
datafusion/functions-aggregate/src/first_last.rs:
##########
@@ -701,9 +713,98 @@ fn convert_to_sort_cols(arrs: &[ArrayRef], sort_exprs: 
&LexOrdering) -> Vec<Sort
 #[cfg(test)]
 mod tests {
     use arrow::array::Int64Array;
+    use arrow_schema::Schema;
+    use compute::SortOptions;
+    use datafusion_physical_expr::{expressions::col, PhysicalSortExpr};
 
     use super::*;
 
+    #[test]
+    fn test_last_value_with_order_bys() -> Result<()> {
+        // TODO: Move this kind of test to slt, we don't have a nice way to 
define the batch size for each `update_batch`

Review Comment:
   Even for memory (not the nicest but still existing), it can be controlled by 
either `set batch_size` before `INSERT into memory_table SELECT FROM ...`,  or 
by multiple `INSERT INTO memory_table VALUES`, where each `values` has required 
batch size.



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