Wenchen Fan comments

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                                            Wenchen Fan

[SPARK-45599][CORE] Use object equality in OpenHashSet

`SQLOpenHashSet` also handles null differently. Not sure if `OpenHashSet` already covers it.

[SPARK-45599][CORE] Use object equality in OpenHashSet

thanks, merging to master/3.5!

[SPARK-46937][SQL] Improve concurrency performance for FunctionRegistry

What's the level of concurrency you expect for function registration/lookup? Do you have perf numbers?

[SPARK-46707][SQL][FOLLOWUP] Push down throwable predicate through aggregates

cc @kelvinjian-db

[SPARK-46935][DOCS] Consolidate error documentation

let's fix conflicts and move forward, thanks for the work!

[SPARK-46935][DOCS] Consolidate error documentation

> And this minor change to our workflow for building docs: I think this is fine. During release process, we need to generate all docs so Python development environment is...

[SPARK-46935][DOCS] Consolidate error documentation

thanks, merging to master!

[SPARK-46810][DOCS] Align error class terminology with SQL standard

The JSON field still has `"subClass"`, do we need to rename it?

[SPARK-46810][DOCS] Align error class terminology with SQL standard

oh, sounds good to do it later. Let's rebase this PR and then merge it ASAP.

[SPARK-46810][DOCS] Align error class terminology with SQL standard

thanks, merging to master!