tp: add HyperLogLog and compute per-column cardinality estimates#5156
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LalitMaganti wants to merge 1 commit intomainfrom
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tp: add HyperLogLog and compute per-column cardinality estimates#5156LalitMaganti wants to merge 1 commit intomainfrom
LalitMaganti wants to merge 1 commit intomainfrom
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Add a HyperLogLog implementation in include/perfetto/ext/base/ and use it to compute estimated unique value counts for HasDuplicates columns during Dataframe::Finalize(). The estimates are stored on Column::estimated_unique_count but not yet used by the query planner. Fast paths: skip NoDuplicates/Id columns entirely, use transition counting (no hashing) for sorted columns, HLL for unsorted columns.
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