pitrou commented on code in PR #12755:
URL: https://github.com/apache/arrow/pull/12755#discussion_r849594131


##########
cpp/src/arrow/compute/exec/expression_benchmark.cc:
##########
@@ -69,6 +70,26 @@ static void SimplifyFilterWithGuarantee(benchmark::State& 
state, Expression filt
   }
 }
 
+static void ExecuteScalarExpressionOverhead(benchmark::State& state, 
Expression expr) {
+  const auto rows_per_batch = static_cast<int32_t>(state.range(0));
+  const auto num_batches = 10000000 / rows_per_batch;
+
+  ExecContext ctx;
+  auto dataset_schema = schema({
+      field("x", int64()),
+  });
+  ExecBatch input({Datum(ConstantArrayGenerator::Int64(rows_per_batch, 5))},
+                  /*length=*/1);

Review Comment:
   Hmm, shouldn't this be `/*length=*/rows_per_batch` (it may not actually 
matter, depending on the expression being executed)?



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