thorfour commented on code in PR #24565:
URL: https://github.com/apache/datafusion/pull/24565#discussion_r3845184920


##########
datafusion/optimizer/src/analyzer/type_coercion.rs:
##########
@@ -1083,6 +1083,8 @@ fn extract_window_frame_target_type(col_type: &DataType) 
-> Result<DataType> {
         Ok(DataType::Interval(IntervalUnit::MonthDayNano))
     } else if let DataType::Dictionary(_, value_type) = col_type {
         extract_window_frame_target_type(value_type)
+    } else if let DataType::RunEndEncoded(_, value_type) = col_type {

Review Comment:
   Good call out, we could fix this in the window state code but agreed that it 
should get implemented in the arrow kernels



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