jorisvandenbossche commented on code in PR #35036:
URL: https://github.com/apache/arrow/pull/35036#discussion_r1196486771


##########
cpp/src/arrow/array/data.cc:
##########
@@ -430,8 +443,17 @@ void ArraySpan::FillFromScalar(const Scalar& value) {
     const auto& scalar = checked_cast<const RunEndEncodedScalar&>(value);
     this->child_data.resize(2);
     auto& run_end_type = scalar.run_end_type();
-    auto run_end = MakeScalar(run_end_type, 1).ValueOrDie();
-    this->child_data[0].FillFromScalar(*run_end);
+    switch (run_end_type->id()) {
+      case Type::INT16:
+        SetRunForScalar<Int16Type>(this, run_end_type, this->scratch_space);
+        break;
+      case Type::INT32:
+        SetRunForScalar<Int32Type>(this, run_end_type, this->scratch_space);
+        break;
+      default:
+        DCHECK_EQ(run_end_type->id(), Type::INT64);
+        SetRunForScalar<Int64Type>(this, run_end_type, this->scratch_space);

Review Comment:
   But thanks for the comments! Will clean-up



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