optimizer path

[nevermore3]

What type of PR is this?

• bug
• feature
• enhancement

What problem(s) does this PR solve?

Issue(s) number:

Description:

Data Structure(Previous version)
unordered_map<Value(dstVid), vector<Path> > prePaths;
Only keep dstVid and the paths to the dstVid,
There will be the following problems

Topology is graph 1
problem one : redundant path
As shown in table 1, the third step will start from the two vids C and D to expand, if the start vid information is saved as shown in table 2, the third step only needs to expand from the vid D

problem two : time complexity
comparing graph 1 and graph 2, in the conjunctPath stage, the paths can be grouped according to the startVid, and the time complexity will be reduced

How do you solve it?

Special notes for your reviewer, ex. impact of this fix, design document, etc:

Checklist:

Tests:

• Unit test(positive and negative cases)
• Function test
• Performance test
• N/A

Affects:

• Documentation affected (Please add the label if documentation needs to be modified.)
• Incompatibility (If it breaks the compatibility, please describe it and add the label.）
• If it's needed to cherry-pick (If cherry-pick to some branches is required, please label the destination version(s).)
• Performance impacted: Consumes more CPU/Memory

Release notes:

Please confirm whether to be reflected in release notes and how to describe:

ex. Fixed the bug .....

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.95%. Comparing base (26f8fc8) to head (24eb885).
Report is 629 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4162      +/-   ##
==========================================
+ Coverage   84.94%   84.95%   +0.01%     
==========================================
  Files        1319     1321       +2     
  Lines      131077   131180     +103     
==========================================
+ Hits       111343   111450     +107     
+ Misses      19734    19730       -4     

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