alamb commented on code in PR #7774:
URL: https://github.com/apache/arrow-rs/pull/7774#discussion_r2198333115


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arrow-select/src/coalesce/primitive.rs:
##########
@@ -19,13 +19,15 @@ use crate::coalesce::InProgressArray;
 use arrow_array::cast::AsArray;
 use arrow_array::{Array, ArrayRef, ArrowPrimitiveType, PrimitiveArray};
 use arrow_buffer::{NullBufferBuilder, ScalarBuffer};
-use arrow_schema::ArrowError;
+use arrow_schema::{ArrowError, DataType};
 use std::fmt::Debug;
 use std::sync::Arc;
 
 /// InProgressArray for [`PrimitiveArray`]
 #[derive(Debug)]
 pub(crate) struct InProgressPrimitiveArray<T: ArrowPrimitiveType> {
+    /// Data type of the array
+    data_type: DataType,

Review Comment:
   previously primitive arrays like TimestampNanosecond would lose the timezone 
information. This fixes the issue



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