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Chelis docs

Pandas comparison

Coral uses pandas as its behavioral reference for the first validated frame slice.

Current parity-backed scope:

  • construction from typed pairs
  • boolean-mask filtering
  • head, tail, and slice
  • rename, with_column, and drop_column
  • float-NaN helpers
  • vertical concat
  • numeric describe
  • sort_by on int, float, bool, and string columns
  • single-key group_by with sum / mean / count / min / max
  • string-key inner_join and left_join for the current supported output slice
  • CSV/JSON read-write expectations for int / float / bool / string columns
  • rolling_sum, rolling_mean, rolling_std, rolling_min, rolling_max
  • ewm(alpha, adjust=False)

Documented deltas:

  • stripped Frame/GroupBy/Join bare builds are clean on chelis v0.7.6: build, link, and execution all pass; acceptance gate is fixture goldens plus the compile-level probe in parity/run_parity.py
  • GroupBy, Join, and IO are currently fixture-backed plus compile-checked
  • Window and Frame both have an executed runtime parity lane; GroupBy, Join, and IO are fixture-backed plus compile-checked
  • Chelis-native correctness lives in tests/*.ch (chelis test tests/ --jobs auto); pandas comparison work and goldens live in parity/