vbarua commented on code in PR #13127:
URL: https://github.com/apache/datafusion/pull/13127#discussion_r1826045355


##########
datafusion/substrait/src/logical_plan/consumer.rs:
##########
@@ -1053,15 +1077,123 @@ pub async fn from_substrait_rel(
                     return not_impl_err!("Unsupported exchange kind: 
{exchange_kind:?}");
                 }
             };
-            Ok(LogicalPlan::Repartition(Repartition {
+            let plan = LogicalPlan::Repartition(Repartition {
                 input,
                 partitioning_scheme,
-            }))
+            });
+            apply_emit_kind(exchange.common.as_ref(), plan)
         }
         _ => not_impl_err!("Unsupported RelType: {:?}", rel.rel_type),
     }
 }
 
+fn retrieve_emit_kind(rel_common: Option<&RelCommon>) -> EmitKind {
+    // the default EmitKind is Direct if it is not set explicitly
+    let default = EmitKind::Direct(rel_common::Direct {});
+    rel_common
+        .and_then(|rc| rc.emit_kind.as_ref())
+        .map_or(default, |ek| ek.clone())
+}
+
+fn contains_volatile_expr(proj: &Projection) -> Result<bool> {

Review Comment:
   > but what if it's a fairly complicated subquery expression that's being 
repeated?
   
   I'm going to choose to leave that as a follow-up and/or punt to the 
optimizer if that's okay?



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