Yukang-Lian opened a new pull request, #66306:
URL: https://github.com/apache/doris/pull/66306
## What changed
- Save the original target-column row count before sparse-column preparation.
- Use the saved row count as the destination offset.
- Add regression coverage for a reserve-only leading `BOOLEAN` column
followed by a nullable fixed-width `BIGINT` column in the same value group.
## Why
The leading value column may reserve capacity without increasing its size.
Deriving the destination offset from its post-prepare size can therefore select
the wrong position.
## Test
- The focused UT was not run locally on this branch.
- The equivalent focused UT passed on SelectDB Core 3.1 with ldbtoolchain
Clang 16.0.6 and ASAN:
`./run-be-ut.sh --run
--filter='VerticalCompactionTest.TestUniqueKeyVerticalMergeWithNullableSparseColumn'
-j 80`
- The equivalent fix and regression scenario were reviewed on this branch;
clang-format 16.0.6 and `git diff --check` passed.
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