[SPARK-53848] Add ability to support Alpha family in Theta Aggregates #52551
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What changes were proposed in this pull request?
Adding ability to use ALPHA family for Theta Sketch
Theta sketch aggregate currently supports only quick select.
Why are the changes needed?
Consumers like Iceberg might benefit will benefit from the sketch aggregate if has the ability to specify
ALPHA familyIceberg specification to use ALPHA sketches
Custom implementation of theta sketch aggregates in Iceberg that can be replaced with Spark Theta aggregates
Does this PR introduce any user-facing change?
No
How was this patch tested?
Unit tests
Was this patch authored or co-authored using generative AI tooling?
No