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HyperLogLog cardinality

Flajolet et al., 2007

Estimate distinct values in billions of rows with <2% error.

t-digest quantiles

Dunning & Ertl, 2019

Accurate median and percentile estimates with bounded memory.

Mahalanobis outlier detection

Mahalanobis, 1936

Catch multivariate outliers accounting for correlations.

Kolmogorov-Smirnov drift

Kolmogorov, 1933

Detect distribution drift between profiling runs.

MinHash + Jaccard similarity

Broder, 1997

Find near-duplicate columns across your entire warehouse.

Benford's law accuracy

Benford, 1938

Flag financial columns that deviate from natural digit distributions.

Isolation Forest anomalies

Liu et al., 2008

Unsupervised tabular anomaly detection without labeled data.