iChauster commented on code in PR #13426:
URL: https://github.com/apache/arrow/pull/13426#discussion_r923412831


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cpp/src/arrow/compute/exec/asof_join_benchmark.cc:
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@@ -0,0 +1,159 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#include <boost/process.hpp>
+#include <string>
+
+#include "benchmark/benchmark.h"
+
+#include "arrow/compute/exec/test_util.h"
+#include "arrow/dataset/file_parquet.h"
+#include "arrow/table.h"
+#include "arrow/testing/future_util.h"
+
+namespace arrow {
+namespace compute {
+
+static const char* time_col = "time";
+static const char* key_col = "id";
+const int default_start = 0;
+const int default_end = 500;
+
+struct TableSourceNodeStats {
+  ExecNode* execNode;
+  size_t total_rows;
+  size_t total_bytes;
+};
+
+static TableSourceNodeStats MakeTableSourceNode(
+    std::shared_ptr<arrow::compute::ExecPlan>& plan, TableGenerationProperties 
properties,
+    int batch_size) {
+  std::shared_ptr<Table> table = MakeRandomTable(properties);
+  size_t row_size = sizeof(double) * (table.get()->schema()->num_fields() - 2) 
+
+                    sizeof(int64_t) + sizeof(int32_t);
+  size_t rows = table.get()->num_rows();
+  return {*arrow::compute::MakeExecNode(
+              "table_source",  // registered type
+              plan.get(),      // execution plan
+              {},              // inputs
+              arrow::compute::TableSourceNodeOptions(table, batch_size)),
+          rows, row_size * rows};
+}
+
+static void TableJoinOverhead(benchmark::State& state,
+                              TableGenerationProperties left_table_properties,
+                              int left_table_batch_size,
+                              TableGenerationProperties right_table_properties,
+                              int right_table_batch_size, int num_right_tables,
+                              std::string factory_name, ExecNodeOptions& 
options) {
+  ExecContext ctx(default_memory_pool(), arrow::internal::GetCpuThreadPool());
+  size_t rows = 0;
+  size_t bytes = 0;
+  for (auto _ : state) {
+    state.PauseTiming();
+
+    ASSERT_OK_AND_ASSIGN(std::shared_ptr<arrow::compute::ExecPlan> plan,
+                         ExecPlan::Make(&ctx));
+    left_table_properties.column_prefix = "lt";
+    left_table_properties.seed = 0;

Review Comment:
   Hmm, although the input is all the same, the way this is written right now 
causes all the nodes to be tied to the lifespan of the `plan` (we would have to 
rebuild the nodes/plan each iteration). Maybe I'll refactor this slightly so we 
can at least keep the tables in memory and reuse those objects. Otherwise, we 
might have to go a level lower than `MakeExecNode`?



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