fenfeng9 commented on PR #50768:
URL: https://github.com/apache/arrow/pull/50768#issuecomment-5158901120
Here are some examples from a local GDB session.
### RunEndEncodedType
```cpp
RunEndEncodedType run_end_encoded_type(int32(), utf8());
auto heap_run_end_encoded_type =
run_end_encoded(int32(), utf8());
(gdb) p run_end_encoded_type
$1 = arrow::run_end_encoded(arrow::int32(), arrow::utf8())
(gdb) p *heap_run_end_encoded_type
$2 = (std::__shared_ptr_access<arrow::DataType, (__gnu_cxx::_Lock_policy)2,
false, false>::element_type &) @0x555555f52f10:
arrow::run_end_encoded(arrow::int32(), arrow::utf8())
```
### RunEndEncodedScalar
```cpp
auto run_end_encoded_scalar_type =
run_end_encoded(int32(), utf8());
RunEndEncodedScalar run_end_encoded_scalar{
MakeScalar("foo"), run_end_encoded_scalar_type};
RunEndEncodedScalar run_end_encoded_scalar_null{
run_end_encoded_scalar_type};
(gdb) p run_end_encoded_scalar
$3 = arrow::RunEndEncodedScalar of value
arrow::StringScalar of size 3, value "foo"
(gdb) p run_end_encoded_scalar_null
$4 = arrow::RunEndEncodedScalar of type
arrow::run_end_encoded(arrow::int32(), arrow::utf8()),
null value
```
### RunEndEncodedArray
```cpp
// Encodes ["foo", "foo", null, null, null].
auto run_end_encoded_run_ends =
SliceArrayFromJSON(int32(), "[2, 5]");
auto run_end_encoded_values =
SliceArrayFromJSON(utf8(), R"(["foo", null])");
auto heap_run_end_encoded_array =
*RunEndEncodedArray::Make(
5, run_end_encoded_run_ends,
run_end_encoded_values);
auto heap_run_end_encoded_array_sliced =
heap_run_end_encoded_array->Slice(1, 3);
(gdb) p *heap_run_end_encoded_array
$5 = (std::__shared_ptr_access<arrow::Array, (__gnu_cxx::_Lock_policy)2,
false, false>::element_type &) @0x555555fab440:
arrow::RunEndEncodedArray of type
arrow::run_end_encoded(arrow::int32(), arrow::utf8()),
length 5, offset 0, null count 0
(gdb) p *heap_run_end_encoded_array_sliced
$6 = (std::__shared_ptr_access<arrow::Array, (__gnu_cxx::_Lock_policy)2,
false, false>::element_type &) @0x555555f7dd60:
arrow::RunEndEncodedArray of type
arrow::run_end_encoded(arrow::int32(), arrow::utf8()),
length 3, offset 1, null count 0
```
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