Function MakeDictionaryBatch

cpp/src/arrow/ipc/read_write_test.cc:1796–1813

      public ::testing::TestWithParam<MakeRecordBatch*> {};

Status MakeDictionaryBatch(std::shared_ptr<RecordBatch>* out) {
  auto f0_type = arrow::dictionary(int32(), utf8());
  auto f1_type = arrow::dictionary(int8(), utf8());

  auto dict = ArrayFromJSON(utf8(), "[\"foo\", \"bar\", \"baz\"]");

  auto indices0 = ArrayFromJSON(int32(), "[1, 2, null, 0, 2, 0]");
  auto indices1 = ArrayFromJSON(int8(), "[0, 0, 2, 2, 1, 1]");

  auto a0 = std::make_shared<DictionaryArray>(f0_type, indices0, dict);
  auto a1 = std::make_shared<DictionaryArray>(f1_type, indices1, dict);

  // construct batch
  auto schema = ::arrow::schema({field("dict1", f0_type), field("dict2", f1_type)});

  *out = RecordBatch::Make(schema, 6, {a0, a1});
  return Status::OK();
}

// A utility that supports reading/writing record batches,
// and manually specifying dictionaries.