[C++] Incorrect Logic for AdaptiveUIntBuilder::AppendValues

[andishgar]

Describe the bug, including details regarding any error messages, version, and platform.

The following code

TEST(TestAdaptiveUIntBuilderWithStartIntSize, MyTest) {
  AdaptiveUIntBuilder builder;
  ASSERT_OK(builder.Append(1));
  ASSERT_OK(builder.Append(2));
  ASSERT_OK(builder.Append(3));
  ASSERT_OK(builder.Append(4));
  std::vector<uint64_t> values{5,6,7,8};
  ASSERT_OK(builder.AppendValues(values.data(),4));
  auto array = builder.Finish().ValueOrDie();
  ARROW_LOGGER_INFO("",array->ToString());
}

produces the following result because the pending data is not committed here:

[
  1,
  2,
  3,
  4
]

Component(s)

C++