[ENH] Add anti joins to conditional_join - #1633
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Summary
how="left_anti"andhow="right_anti"toconditional_joinkeep="first"orkeep="last"ELI5
A conditional join asks whether rows from two tables satisfy the supplied rules. A left anti join keeps the left rows that never find a matching right row. A right anti join does the same from the other direction. For example, it can find events that do not fall inside any time window.
Performance
On a local 200,000-row
_create_framemicrobenchmark, the shared boolean-mask implementation improved unmatched-position handling by approximately 2.2x to 3.5x across left, right, outer, and anti joins. Broader result-materialization work is tracked separately in #1632.Validation
pixi run -e tests test: 1334 passed, 5 skipped, 48 xfailed, 17 xpassedgit diff --check: passedRepository-wide pre-commit currently reports existing Ruff failures in example notebooks and
janitor/functions/convert_date.py; none are in files changed by this PR.The
pixi.locklocal-package version refresh was generated by the repositorypixi-installhook after the upstream 0.32.24 version bump.Fixes #1627
Related: #1632