Fix merge operator mark

[andyfengHKU]

No description provided.

[codecov]

Codecov Report

Patch coverage: 83.33% and project coverage change: +0.02% 🎉

Comparison is base (25dfe2c) 89.75% compared to head (44a70ab) 89.78%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1911      +/-   ##
==========================================
+ Coverage   89.75%   89.78%   +0.02%     
==========================================
  Files         869      869              
  Lines       31103    31119      +16     
==========================================
+ Hits        27918    27940      +22     
+ Misses       3185     3179       -6     

Files Changed	Coverage Δ
src/planner/plan/plan_update.cpp	93.40% <80.00%> (-1.40%)	⬇️
src/binder/bind/bind_updating_clause.cpp	96.18% <100.00%> (+0.05%)	⬆️

... and 1 file with indirect coverage changes

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