zanmato1984 commented on code in PR #39487:
URL: https://github.com/apache/arrow/pull/39487#discussion_r1462860750


##########
cpp/src/arrow/acero/hash_join_node_test.cc:
##########
@@ -1893,58 +1893,146 @@ TEST(HashJoin, CheckHashJoinNodeOptionsValidation) {
   }
 }
 
-TEST(HashJoin, ResidualFilter) {
-  for (bool parallel : {false, true}) {
-    SCOPED_TRACE(parallel ? "parallel/merged" : "serial");
-
-    BatchesWithSchema input_left;
-    input_left.batches = {ExecBatchFromJSON({int32(), int32(), utf8()}, R"([
-                   [1, 6, "alpha"],
-                   [2, 5, "beta"],
-                   [3, 4, "alpha"]
-                 ])")};
-    input_left.schema =
-        schema({field("l1", int32()), field("l2", int32()), field("l_str", 
utf8())});
-
-    BatchesWithSchema input_right;
-    input_right.batches = {ExecBatchFromJSON({int32(), int32(), utf8()}, R"([
-                   [5, 11, "alpha"],
-                   [2, 12, "beta"],
-                   [4, 16, "alpha"]
-                 ])")};
-    input_right.schema =
-        schema({field("r1", int32()), field("r2", int32()), field("r_str", 
utf8())});
+class ResidualFilterCaseRunner {
+ public:
+  ResidualFilterCaseRunner(BatchesWithSchema left_input, BatchesWithSchema 
right_input)
+      : left_input_(std::move(left_input)), 
right_input_(std::move(right_input)) {}
+
+  void Run(JoinType join_type, const std::vector<FieldRef>& left_keys,
+           const std::vector<FieldRef>& right_keys, Expression filter,
+           const std::vector<ExecBatch>& expected) const {
+    RunInternal(HashJoinNodeOptions{join_type, std::move(left_keys),
+                                    std::move(right_keys), std::move(filter)},
+                expected);
+  }
+
+  void Run(JoinType join_type, std::vector<FieldRef> left_keys,
+           const std::vector<FieldRef> right_keys, std::vector<FieldRef> 
left_output,
+           const std::vector<FieldRef> right_output, Expression filter,
+           const std::vector<ExecBatch>& expected) const {
+    RunInternal(HashJoinNodeOptions{join_type, std::move(left_keys),
+                                    std::move(right_keys), 
std::move(left_output),
+                                    std::move(right_output), 
std::move(filter)},
+                expected);
+  }
+
+ private:
+  void RunInternal(const HashJoinNodeOptions& options,
+                   const std::vector<ExecBatch>& expected) const {
+    auto join_type_str = JoinTypeString(options.join_type);

Review Comment:
   Good hint. Replied together in the following comment.



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