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feat: add GroupsAccumulator for variance, stddev, covariance, correlation - #4254

Merged

andygrove merged 17 commits into

apache:mainfrom

andygrove:groups-accumulator-stats

May 19, 2026

Merged

feat: add GroupsAccumulator for variance, stddev, covariance, correlation#4254
andygrove merged 17 commits into
apache:mainfrom
andygrove:groups-accumulator-stats

Commits on May 6, 2026
- refactor: extract Welford update/merge helpers
  andygrove
  committed
  9dd5e64
- refactor: route VarianceAccumulator through welford helpers
  andygrove
  committed
  ec03f70
- refactor: route CovarianceAccumulator through welford helpers
  andygrove
  committed
  a291f52
- feat: add VarianceGroupsAccumulator for grouped fast path
  andygrove
  committed
  aaa4104
- feat: add StddevGroupsAccumulator wrapping variance
  andygrove
  committed
  a1b206d
- feat: add CovarianceGroupsAccumulator for grouped fast path
  andygrove
  committed
  f6685d7
- feat: add CorrelationGroupsAccumulator for grouped fast path
  andygrove
  committed
  67b3ee0
- chore: appease clippy on grouped accumulator additions
  andygrove
  committed
  26c252c
- fix: emit NaN for single-row correlation in legacy mode
  andygrove
  committed
  9181e92
- chore: apply make format
  andygrove
  committed
  b5b6e44
- chore: appease clippy needless_range_loop in correlation grouped accumulator
  andygrove
  committed
  43ca004
- test: enable Comet shuffle manager in CometBenchmarkBase
  andygrove
  committed
  7c0fd61
Commits on May 8, 2026
Commits on May 19, 2026
- Merge branch 'main' into groups-accumulator-stats
  mbutrovich
  authored
  a5c56b8