Implement xxhash algorithms as part of the expression API

[HectorPascual]

Is your feature request related to a problem or challenge?

I am currently in need of using datafusion SQL query engine (through delta-rs merge operation) to hash with a specific hashing algorithm.

https://xxhash.com/
https://github.com/Cyan4973/xxHash
Rust implementation : https://crates.io/crates/twox-hash

Describe the solution you'd like

I'd like the hashing functions xxhash32 and xxhash64 to be part of datafusion expression API so the functions can be used in SQL context for hashing data.

[alamb]

You could also implement this as a user defined function perhaps

[HectorPascual]

Hi, thanks for the reply.

That is true, although, my concern comes from this other issue raised in delta-rs project (link below), since I need to use this hash operation in a Delta merge operation.

Unless I change the codebase for the delta-rs project, I'd be unable to create an UDF (not sure if there's a way to create and register it in the delta-rs context in python, sounds complicated)

delta-io/delta-rs#3105 (comment)