[SPARK-54846][SQL] Add codegen support for KLL sketch GetN functions #53614
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What changes were proposed in this pull request?
This PR adds whole-stage code generation support for three KLL sketch functions:
Why are the changes needed?
Currently, these functions use CodegenFallback, which causes them to fall back to interpreted interpreted evaluation, which is typically slower than generated code for operations processing millions of rows
Does this PR introduce any user-facing change?
No.
How was this patch tested?
All existing SQL tests pass
Was this patch authored or co-authored using generative AI tooling?
No.