[lordsunland]

The main blocker is specialization as it's being used in several places including parquet and arrow crate. As this feature is unlikely to be stabilized, we'll need to replace it with something else but so far it is challenging.

[tomhoule]

Thanks for clarifying that the plan is to stop relying on it :) Is there a specific place/issue/ticket to discuss this? If time allows, I would be interested in helping out.

[lordsunland]

There is https://issues.apache.org/jira/browse/ARROW-6717 tracking moving to stable Rust, and https://issues.apache.org/jira/browse/ARROW-4678 is also relevant. Feel free to create a sub-task under the former to remove specialization :)