SubhamSinghal commented on PR #21859:
URL: https://github.com/apache/datafusion/pull/21859#issuecomment-4324463570
**`e.time >= w.start` (lower bound):** The build side is sorted by
`start_time` ascending, and a monotonic boundary pointer advances forward as we
process sorted probe
rows. For probe value `v`, all build rows `[0..=boundary]` satisfy
`start_time <= v`. This is amortized O(1) per probe row since the pointer only
moves forward.
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