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Consider adding variance / other statistical aggregation functions :cherries: #2177
Population & sample variance are offered by almost every DB we support. In addition, Postgres & BigQuery have covariance and correlation coefficient options. Should we expose them as aggregation options?
Someone must use these, otherwise their support wouldn't be ubiquitous. It would be nice to hear from one of those people and gauge their interest. Is this BASIC need for all users? Should we embrace the complexity?