Update cost model for shortest path

[andyfengHKU]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01 ⚠️

Comparison is base (4e5f17d) 92.28% compared to head (4c67292) 92.28%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1499      +/-   ##
==========================================
- Coverage   92.28%   92.28%   -0.01%     
==========================================
  Files         675      676       +1     
  Lines       24275    24273       -2     
==========================================
- Hits        22402    22400       -2     
  Misses       1873     1873              

Impacted Files	Coverage Δ
...include/planner/join_order/cardinality_estimator.h	100.00% <ø> (ø)
src/optimizer/filter_push_down_optimizer.cpp	98.03% <100.00%> (-0.02%)	⬇️
src/planner/join_order/cardinality_estimator.cpp	96.07% <100.00%> (-0.48%)	⬇️
src/planner/join_order/cost_model.cpp	100.00% <100.00%> (ø)
src/planner/join_order/join_order_util.cpp	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes

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