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enhancementNew feature or requestNew feature or request
Description
Is your feature request related to a problem? Please describe.
Currently, KLLSketch and DataType analyzer is implemented use the UserDefinedAggregateFunction
| private [sql] class StatefulKLLSketch( | 
| private[sql] class StatefulDataType extends UserDefinedAggregateFunction { | 
which is considered deprecated and should be replaced with Aggregator which offer much greater performance which was outlined here apache/spark#25024 (comment)
Describe the solution you'd like
Reimplement StatefulDataType and StatefulKLLSketch using Aggregator
I am happy to help with this implementation.
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enhancementNew feature or requestNew feature or request