[C++] Implement REE support in ArrayFromJSONString

[pitrou]

Describe the enhancement requested

Currently, ArrayFromJSONString doesn't support emitting run-end-encoded data.

Like dictionary-encoded data, this could be implemented in two ways:

1. Implement implicit run-end encoding in ArrayFromJSONString when a REE type is given
2. Expose a separate function to explicitly pass the run ends and values, for example REEArrayFromJSONString(const std::shared_ptr<DataType>&, std::string_view run_ends_json, std::string_view values_json)

Component(s)

C++

[pitrou]

This can probably depend on #37221

[felipecrv]

@felipecrv (to get this on my "participating" and "mentioned" inboxes)

[thisisnic]

This issue has been marked as stale because it has had no activity in the past 2 years. Please remove the stale label or comment below, or this issue will be closed in 14 days.

[thisisnic]

This issue has been closed because there has been no activity for the 14 days since the stale warning. Feel free to reopen if this has been closed in error.

[pitrou]

@tadeja @Alex-PLACET