wesm commented on a change in pull request #7240:
URL: https://github.com/apache/arrow/pull/7240#discussion_r428737652



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File path: cpp/src/arrow/compute/kernels/codegen_internal.cc
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@@ -0,0 +1,153 @@
+// 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 "arrow/compute/kernels/codegen_internal.h"
+
+#include <cstdint>
+#include <memory>
+#include <mutex>
+#include <vector>
+
+#include "arrow/type_fwd.h"
+#include "arrow/util/logging.h"
+
+namespace arrow {
+namespace compute {
+
+void ExecFail(KernelContext* ctx, const ExecBatch& batch, Datum* out) {
+  ctx->SetStatus(Status::NotImplemented("This kernel is malformed"));
+}
+
+void BinaryExecFlipped(KernelContext* ctx, ArrayKernelExec exec,
+                       const ExecBatch& batch, Datum* out) {
+  ExecBatch flipped_batch = batch;
+  Datum tmp = flipped_batch.values[0];
+  flipped_batch.values[0] = flipped_batch.values[1];
+  flipped_batch.values[1] = tmp;
+  exec(ctx, flipped_batch, out);
+}
+
+std::vector<std::shared_ptr<DataType>> g_signed_int_types;
+std::vector<std::shared_ptr<DataType>> g_unsigned_int_types;
+std::vector<std::shared_ptr<DataType>> g_int_types;
+std::vector<std::shared_ptr<DataType>> g_floating_types;
+std::vector<std::shared_ptr<DataType>> g_numeric_types;
+std::vector<std::shared_ptr<DataType>> g_base_binary_types;
+std::vector<std::shared_ptr<DataType>> g_temporal_types;
+std::vector<std::shared_ptr<DataType>> g_primitive_types;
+static std::once_flag codegen_static_initialized;
+
+static void InitStaticData() {
+  // Signed int types
+  g_signed_int_types.push_back(int8());
+  g_signed_int_types.push_back(int16());
+  g_signed_int_types.push_back(int32());
+  g_signed_int_types.push_back(int64());
+
+  // Unsigned int types
+  g_unsigned_int_types.push_back(uint8());
+  g_unsigned_int_types.push_back(uint16());
+  g_unsigned_int_types.push_back(uint32());
+  g_unsigned_int_types.push_back(uint64());
+
+  // All int types
+  Extend(g_unsigned_int_types, &g_int_types);
+  Extend(g_signed_int_types, &g_int_types);
+
+  // Floating point types
+  g_floating_types.push_back(float32());
+  g_floating_types.push_back(float64());
+
+  // Numeric types
+  Extend(g_int_types, &g_numeric_types);
+  Extend(g_floating_types, &g_numeric_types);
+
+  // Temporal types
+  g_temporal_types.push_back(date32());
+  g_temporal_types.push_back(date64());
+  g_temporal_types.push_back(time32(TimeUnit::SECOND));
+  g_temporal_types.push_back(time32(TimeUnit::MILLI));
+  g_temporal_types.push_back(time64(TimeUnit::MICRO));
+  g_temporal_types.push_back(time64(TimeUnit::NANO));
+  g_temporal_types.push_back(timestamp(TimeUnit::SECOND));
+  g_temporal_types.push_back(timestamp(TimeUnit::MILLI));
+  g_temporal_types.push_back(timestamp(TimeUnit::MICRO));
+  g_temporal_types.push_back(timestamp(TimeUnit::NANO));
+
+  // Base binary types (without FixedSizeBinary)
+  g_base_binary_types.push_back(binary());
+  g_base_binary_types.push_back(utf8());
+  g_base_binary_types.push_back(large_binary());
+  g_base_binary_types.push_back(large_utf8());
+
+  // Non-parametric, non-nested types. This also DOES NOT include
+  //
+  // * Decimal
+  // * Fixed Size Binary
+  g_primitive_types.push_back(null());
+  g_primitive_types.push_back(boolean());
+  Extend(g_numeric_types, &g_primitive_types);
+  Extend(g_temporal_types, &g_primitive_types);
+  Extend(g_base_binary_types, &g_primitive_types);
+}
+
+const std::vector<std::shared_ptr<DataType>>& BaseBinaryTypes() {
+  std::call_once(codegen_static_initialized, InitStaticData);
+  return g_base_binary_types;
+}
+
+const std::vector<std::shared_ptr<DataType>>& SignedIntTypes() {
+  std::call_once(codegen_static_initialized, InitStaticData);

Review comment:
       Will look




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