andishgar commented on code in PR #46031:
URL: https://github.com/apache/arrow/pull/46031#discussion_r2057586695


##########
cpp/src/arrow/record_batch_test.cc:
##########
@@ -1215,6 +1244,21 @@ Result<std::shared_ptr<Array>> MakeStatisticsArray(
                                                        
std::move(statistics_array)};
   return std::make_shared<StructArray>(struct_type, n_columns, struct_arrays);
 }
+
+std::shared_ptr<Array> GenerateString(
+    const std::shared_ptr<::arrow::DataType>& data_type) {
+  if (data_type->id() == Type::FIXED_SIZE_BINARY) {
+    auto byte_width = data_type->byte_width();
+    auto a = std::string(byte_width, 'a');
+    auto b = std::string(byte_width, 'b');
+    auto c = std::string(byte_width, 'c');
+    std::stringstream ss;
+    ss << R"([")" << a << R"(",")" << b << R"(",")" << c << R"("])";
+    return ArrayFromJSON(data_type, ss.str());
+  }
+  return ArrayFromJSON(data_type, R"(["a","b","c"])");

Review Comment:
   Generally,I already have some studies about CPU pipelines and branch 
prediction in a computer architecture textbook (csapp). Does my style of code 
have any point in this subject? (Although this is a test, and as I figure out 
readability, it's much more important. I know one way Arrow tackles this is to 
define ARROW_PREDICATE_TRUE and ARROW_PREDICATE_FALSE, which becomes handy in 
error-checking code.)



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