fix: add explicit type casts while merge

[t1g0rz]

Related Issue(s)

• closes Inconsistent schema handling for int64 columns in Delta Table updated with pandas object type #3034

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 72.66%. Comparing base (2501f2f) to head (8b5f421).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/core/src/operations/merge/mod.rs	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3050      +/-   ##
==========================================
- Coverage   72.67%   72.66%   -0.01%     
==========================================
  Files         129      129              
  Lines       41625    41626       +1     
  Branches    41625    41626       +1     
==========================================
- Hits        30251    30248       -3     
- Misses       9414     9417       +3     
- Partials     1960     1961       +1     

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[ion-elgreco]

Thanks! @t1g0rz

Exactly what I had in mind