felipecrv commented on code in PR #34195:
URL: https://github.com/apache/arrow/pull/34195#discussion_r1126917285


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cpp/src/arrow/compute/kernels/vector_run_end_encode_test.cc:
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@@ -0,0 +1,211 @@
+// 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 <gtest/gtest.h>
+
+#include "arrow/array.h"
+#include "arrow/builder.h"
+#include "arrow/compute/api_vector.h"
+#include "arrow/testing/gtest_util.h"
+#include "arrow/util/logging.h"
+#include "arrow/util/ree_util.h"
+
+namespace arrow {
+namespace compute {
+
+namespace {
+
+struct REETestData {
+  static REETestData JSON(std::shared_ptr<DataType> data_type, std::string 
input_json,
+                          std::string expected_values_json,
+                          std::string expected_run_ends_json, int64_t 
input_offset = 0) {
+    auto input_array = ArrayFromJSON(data_type, input_json);
+    REETestData result;
+    result.input = input_array->Slice(input_offset);
+    result.expected_values = ArrayFromJSON(data_type, expected_values_json);
+    result.expected_run_ends_json = std::move(expected_run_ends_json);
+    result.string = input_json;
+    return result;
+  }
+
+  static REETestData NullArray(int64_t input_length, int64_t input_offset = 0) 
{
+    auto input_array = std::make_shared<arrow::NullArray>(input_length);
+    REETestData result;
+    result.input = input_array->Slice(input_offset);
+    const int64_t input_slice_length = result.input->length();
+    result.expected_values =
+        std::make_shared<arrow::NullArray>(input_slice_length > 0 ? 1 : 0);
+    result.expected_run_ends_json =
+        input_slice_length > 0 ? "[" + std::to_string(input_slice_length) + 
"]" : "[]";
+    result.string = "[null * " + std::to_string(input_slice_length) + "]";
+    return result;
+  }
+
+  template <typename ArrowType>
+  static REETestData TypeMinMaxNull() {
+    using CType = typename ArrowType::c_type;
+    REETestData result;
+    NumericBuilder<ArrowType> builder;
+    ARROW_EXPECT_OK(builder.Append(std::numeric_limits<CType>::min()));
+    ARROW_EXPECT_OK(builder.AppendNull());
+    ARROW_EXPECT_OK(builder.Append(std::numeric_limits<CType>::max()));
+    result.input = builder.Finish().ValueOrDie();
+    result.expected_values = result.input;
+    result.expected_run_ends_json = "[1, 2, 3]";
+    result.string = "Type min, max, & null values";
+    return result;
+  }
+
+  std::shared_ptr<Array> input;
+  std::shared_ptr<Array> expected_values;
+  std::string expected_run_ends_json;
+  // only used for gtest output
+  std::string string;
+};
+
+}  // namespace
+
+class TestRunEndEncodeDecode : public ::testing::TestWithParam<
+                                   std::tuple<REETestData, 
std::shared_ptr<DataType>>> {
+ public:
+  void AddArtificialOffsetInChildArray(ArrayData* array, int64_t offset) {
+    auto& child = array->child_data[1];
+    auto builder = MakeBuilder(child->type).ValueOrDie();
+    ARROW_CHECK_OK(builder->AppendNulls(offset));

Review Comment:
   Thank you for the tip. Done.



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