Adjust get neighbor plan

[liuyu85cn]

What type of PR is this?

• bug
• [ X] feature
• enhancement

What does this PR do?

Which issue(s)/PR(s) this PR relates to?

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

Additional context:

Checklist：

• Documentation affected （Please add the label if documentation needs to be modified.)
• Incompatible （If it is incompatible, please describe it and add corresponding label.）
• Need to cherry-pick （If need to cherry-pick to some branches, please label the destination version(s).)
• Performance impacted: Consumes more CPU/Memory

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[codecov-commenter]

Codecov Report

Merging #3458 (7f533b5) into master (ab73b4c) will increase coverage by 0.00%.
The diff coverage is 90.08%.

@@            Coverage Diff            @@
##           master    #3458     +/-   ##
=========================================
  Coverage   85.23%   85.23%             
=========================================
  Files        1277     1308     +31     
  Lines      119088   122744   +3656     
=========================================
+ Hits       101502   104622   +3120     
- Misses      17586    18122    +536     

Impacted Files	Coverage Δ
src/clients/meta/MetaClient.cpp	74.73% <0.00%> (-1.19%)	⬇️
src/graph/optimizer/rule/CollapseProjectRule.cpp	98.24% <ø> (ø)
...timizer/rule/OptimizeEdgeIndexScanByFilterRule.cpp	90.54% <ø> (ø)
...ptimizer/rule/OptimizeTagIndexScanByFilterRule.cpp	94.59% <ø> (+4.31%)	⬆️
...h/optimizer/rule/PushLimitDownGetNeighborsRule.cpp	93.75% <ø> (+0.20%)	⬆️
...timizer/rule/PushStepLimitDownGetNeighborsRule.cpp	94.11% <ø> (+0.36%)	⬆️
...imizer/rule/PushStepSampleDownGetNeighborsRule.cpp	93.93% <ø> (ø)
src/graph/util/FTIndexUtils.cpp	4.12% <ø> (ø)
src/graph/validator/FindPathValidator.cpp	84.78% <ø> (ø)
src/graph/validator/MutateValidator.cpp	94.17% <ø> (+0.11%)	⬆️
... and 255 more

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[critical27]

Generally LGTM~

[wenhaocs]

Just some minor issues. Just want to make sure the logic is "if not edge specified, return only the vertex properties". Can you also give an update of the current behavior of GetNeighbors in the description of this PR and GetNeighborsProcessor.cpp ?

[critical27]

Well done~

[panda-sheep]

Good!

[panda-sheep]

👍