Approximate Answers, Exact Decisions: New Sketch Functions for Analytics
Summary
Databricks now offers new sketch functions for approximate answers to analytics questions, including KLL quantile sketches for percentiles, Theta and Tuple sketches for audience overlap, and approximate top-K functions for real-time trending. These functions enable faster, more memory-efficient computations over massive datasets, with mergeable sketches for incremental updates and combined counting and aggregation.
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