yihua opened a new pull request, #18740:
URL: https://github.com/apache/hudi/pull/18740
### Describe the issue this Pull Request addresses
Follow-up to #18736. The newly added `TestBatchedBlobReaderIO` had several
scenarios that re-verified the merge algorithm at the I/O layer when
`TestBatchedBlobReaderMerge` already covers them as cheap unit tests. Each
removed I/O test built a Spark DataFrame and read a real file, so the
duplication was the dominant runtime cost of the new suite.
### Summary and Changelog
- Drops I/O tests whose assertions duplicate merge unit tests:
- contiguous-zero-gap merge
- small-gaps-within-threshold merge
- large-gaps-above-threshold no-merge
- exact threshold boundary (both inclusive and exclusive halves)
- interleaved input ordering
- Folds the single-file batched + non-batched pair into one test (same
input, two `maxGap` values).
- Folds three multi-file scenarios (per-file batching, mixed gap patterns,
interleaved order) into one combined test.
- Result: `TestBatchedBlobReaderIO` goes from 9 → 3 tests, retaining the
three distinct integration claims: I/O reduction end-to-end, one I/O per merged
group, and per-file routing across multiple files.
### Impact
*Tests only.* No production code changes. Merge-algorithm coverage is
unchanged — every removed I/O scenario has a corresponding test in
`TestBatchedBlobReaderMerge`.
This is stacked on #18736; the diff includes that PR's commits until it
lands.
### Risk Level
**none**
### Documentation Update
none
### Contributor's checklist
- [X] Read through [contributor's
guide](https://hudi.apache.org/contribute/how-to-contribute)
- [X] Enough context is provided in the sections above
- [X] Adequate tests were added if applicable
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