enhance: Enable to merge sort one segment

[XuanYang-cn]

Remove the log stack when setting isCompacting

[XuanYang-cn]

/assign @xiaocai2333

[sre-ci-robot]

[ci-v2-notice]
Notice: We are gradually rolling out the new ci-v2 system.

• Legacy CI jobs remain unaffected, you can just ignore ci-v2 if you don't want to run it.
• Additional "ci-v2/*" checkers will run for this PR to ensure the new ci-v2 system is working as expected.
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To rerun ci-v2 checks, comment with:

• /ci-rerun-code-check // for ci-v2/code-check
• /ci-rerun-build // for ci-v2/build
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• /ci-rerun-ut-go // for ci-v2/ut-go
• /ci-rerun-ut-cpp // for ci-v2/ut-cpp
• /ci-rerun-ut // for all ci-v2/ut-integration, ci-v2/ut-go, ci-v2/ut-cpp
• /ci-rerun-e2e-arm // for ci-v2/e2e-arm

If you have any questions or requests, please contact @zhikunyao.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 76.47%. Comparing base (a3b8bcb) to head (6559d95).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/datanode/compactor/mix_compactor.go	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #45652      +/-   ##
==========================================
- Coverage   76.56%   76.47%   -0.09%     
==========================================
  Files        1877     1875       -2     
  Lines      293323   292544     -779     
==========================================
- Hits       224572   223735     -837     
- Misses      61341    61375      +34     
- Partials     7410     7434      +24     

Components	Coverage Δ
Client	78.17% <ø> (ø)
Core	83.19% <ø> (ø)
Go	74.58% <0.00%> (-0.13%)	⬇️

Files with missing lines	Coverage Δ
internal/datanode/compactor/mix_compactor.go	71.08% <0.00%> (-0.21%)	⬇️

... and 40 files with indirect coverage changes

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• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[xiaocai2333]

/lgtm

[tedxu]

/lgtm
/approve

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tedxu, XuanYang-cn

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• internal/datanode/OWNERS [tedxu]

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[XuanYang-cn]

/refresh-label