feat: remove some redundent clone/conversion on constructing MergeScan stream

[waynexia]

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Refer to a related PR or issue link (optional)

What's changed and what's your intention?

Trivial changes. Reported by @WenyXu

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.62%. Comparing base (4ea4122) to head (d24f792).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4632      +/-   ##
==========================================
- Coverage   84.88%   84.62%   -0.27%     
==========================================
  Files        1101     1101              
  Lines      197166   197172       +6     
==========================================
- Hits       167371   166860     -511     
- Misses      29795    30312     +517     

[fengjiachun]

LGTM