Is your feature request related to a problem or challenge? Please describe what you are trying to do.
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
(This section helps Arrow developers understand the context and why for this feature, in addition to the what)

use sort_unstable_by in primitive sorting so that we can have:

1. better memory footprint
2. faster sort
3. consistent stableness behavior with and without limit

Describe the solution you'd like
A clear and concise description of what you want to happen.

use sort_unstable_by in primitive sorting

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.