fix duplicate output column names of join

[jievince]

What type of PR is this?

• bug
• feature
• enhancement

What problem(s) does this PR solve?

Issue(s) number:

Fix #4960

Description:

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 .....

[yixinglu]

Need some TCK cases, such as: MATCH .. MATCH ... RETURN *

[Shylock-Hg]

Need UT of JoinExecutor.

[codecov-commenter]

Codecov Report

Base: 76.84% // Head: 76.90% // Increases project coverage by +0.05% 🎉

Coverage data is based on head (a914d80) compared to base (e1a0283).
Patch coverage: 95.65% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4965      +/-   ##
==========================================
+ Coverage   76.84%   76.90%   +0.05%     
==========================================
  Files        1101     1101              
  Lines       81205    81239      +34     
==========================================
+ Hits        62405    62479      +74     
+ Misses      18800    18760      -40     

Impacted Files	Coverage Δ
src/graph/executor/query/InnerJoinExecutor.cpp	53.61% <ø> (-2.14%)	⬇️
src/graph/executor/query/InnerJoinExecutor.h	100.00% <ø> (ø)
src/graph/executor/query/JoinExecutor.h	100.00% <ø> (ø)
src/graph/util/ExpressionUtils.h	100.00% <ø> (ø)
src/graph/util/ExpressionUtils.cpp	94.51% <89.47%> (+0.23%)	⬆️
src/graph/executor/query/JoinExecutor.cpp	84.21% <100.00%> (+4.21%)	⬆️
src/graph/planner/plan/Query.cpp	72.68% <100.00%> (+4.49%)	⬆️
src/graph/context/Result.cpp	70.00% <0.00%> (-7.78%)	⬇️
src/graph/planner/match/StartVidFinder.cpp	87.50% <0.00%> (-5.84%)	⬇️
src/common/thread/GenericWorker.h	80.76% <0.00%> (-3.85%)	⬇️
... and 33 more

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[yixinglu]

Good Job!