[CBRD-24400] The problem of comparing plan fixed and variable cost respectively

[shparkcubrid]

http://jira.cubrid.org/browse/CBRD-24400

if (af <= bf && aa <= ba)
    return PLAN_COMP_LT
if (bf <= af && ba <= aa)
    return PLAN_COMP_GT;
return PLAN_COMP_UNK;

An unknown case occurs because of the comparison as above. I modify it to compare with the sum of each.

[codecov-commenter]

Codecov Report

Merging #3665 (99f1d00) into develop (9bc2c88) will decrease coverage by 1.19%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #3665      +/-   ##
===========================================
- Coverage    52.07%   50.88%   -1.20%     
===========================================
  Files          515      515              
  Lines       397906   397898       -8     
===========================================
- Hits        207201   202455    -4746     
- Misses      190705   195443    +4738     

Impacted Files	Coverage Δ
src/optimizer/query_planner.c	79.94% <100.00%> (-1.33%)	⬇️
src/method/method_oid_handler.hpp	0.00% <0.00%> (-100.00%)	⬇️
src/method/method_struct_query.hpp	0.00% <0.00%> (-100.00%)	⬇️
src/method/method_struct_oid_info.hpp	0.00% <0.00%> (-100.00%)	⬇️
src/method/method_connection_cl.cpp	0.00% <0.00%> (-83.34%)	⬇️
src/method/method_struct_query.cpp	0.00% <0.00%> (-70.83%)	⬇️
src/method/method_query_handler.cpp	0.00% <0.00%> (-55.40%)	⬇️
src/parser/method_transform.c	14.33% <0.00%> (-51.27%)	⬇️
src/method/method_query_cursor.cpp	0.00% <0.00%> (-50.57%)	⬇️
src/method/method_connection_cl.hpp	0.00% <0.00%> (-50.00%)	⬇️
... and 104 more

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