Mryange opened a new pull request, #63429:
URL: https://github.com/apache/doris/pull/63429
### What problem does this PR solve?
Issue Number: None
Related PR: None
Problem Summary: `MergeSorterState` used the generic copy-based merge path
even when the current top sorted run could return its whole remaining block
before any other run. This adds a direct whole-block fast path guarded by a
total-order check, avoiding unnecessary `insert_range_from` work in inner merge.
### What is changed?
- Add `MergeSortCursor::totally_less_or_equals()` to detect when the current
run is wholly before the next child.
- Return the current block directly from
`MergeSorterState::_merge_sort_read_impl()` when the whole-block condition is
satisfied.
- Add focused BE unit tests for exact-batch and smaller-than-batch
whole-block fast-path cases.
### Release note
None
### Check List (For Author)
- Test: Unit Test
- BE UT: `sh run-be-ut.sh --run --filter='MergeSorterStateTest.*'`
- Behavior changed: No
- Does this need documentation: No
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