Add documentation for approx_count_distinct implementation #421
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Document the Apache DataSketches CPC (Compressed Probability Counting) algorithm used for the approx_count_distinct aggregation. Changes: - Add reference link to Apache DataSketches CPC documentation in aggregations table - Add new section explaining the implementation and benefits of approx_count_distinct - Clarify memory efficiency, mergeability, and accuracy characteristics 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
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Summary
approx_count_distinctThis documentation helps users understand when and why to use
approx_count_distinctfor materialized aggregations, especially for tracking cardinality across large datasets and many time buckets.Test plan
🤖 Generated with Claude Code