fix desc subgraph inputVar

[nevermore3]

What type of PR is this?

• bug
• feature
• enhancement

What problem(s) does this PR solve?

Issue(s) number:

Description:

Before

-----+--------------+--------------+----------------+-------------------------------
|  5 | Subgraph     | 4            |                | outputVar: {                 |
|    |              |              |                |   "colNames": [],            |
|    |              |              |                |   "type": "DATASET",         |
|    |              |              |                |   "name": "__Subgraph_5"     |
|    |              |              |                | }                            |
|    |              |              |                | src: $-._vid                 |
|    |              |              |                | tag_filter:                  |
|    |              |              |                | edge_filter:                 |
|    |              |              |                | filter:                      |

Now:

-----+--------------+--------------+----------------+-------------------------------
|  5 | Subgraph     | 4            |                | outputVar: {                 |
|    |              |              |                |   "colNames": [],            |
|    |              |              |                |   "type": "DATASET",         |
|    |              |              |                |   "name": "__Subgraph_5"     |
|    |              |              |                | }                            |
|    |              |              |                | inputVar: __Dedup_4          |
|    |              |              |                | src: $-._vid                 |
|    |              |              |                | tag_filter:                  |
|    |              |              |                | edge_filter:                 |
|    |              |              |                | filter:                      |

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 .....

[codecov-commenter]

Codecov Report

Base: 77.63% // Head: 78.68% // Increases project coverage by +1.04% 🎉

Coverage data is based on head (91a8239) compared to base (52a177e).
Patch coverage: 92.30% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5299      +/-   ##
==========================================
+ Coverage   77.63%   78.68%   +1.04%     
==========================================
  Files        1110     1110              
  Lines       83382    83383       +1     
==========================================
+ Hits        64736    65608     +872     
+ Misses      18646    17775     -871     

Impacted Files	Coverage Δ
src/graph/planner/plan/Algo.cpp	42.71% <0.00%> (ø)
src/graph/executor/algo/SubgraphExecutor.cpp	96.72% <100.00%> (+1.72%)	⬆️
src/graph/executor/query/DataCollectExecutor.cpp	93.54% <100.00%> (+0.07%)	⬆️
src/common/memory/MemoryTracker.cpp	60.00% <0.00%> (-16.00%)	⬇️
src/common/memory/Memory.h	72.34% <0.00%> (-8.52%)	⬇️
src/common/memory/NewDelete.cpp	56.25% <0.00%> (-6.25%)	⬇️
src/storage/exec/FilterNode.h	90.90% <0.00%> (-4.33%)	⬇️
src/graph/executor/query/IndexScanExecutor.cpp	91.42% <0.00%> (-2.69%)	⬇️
src/storage/mutate/AddVerticesProcessor.cpp	86.07% <0.00%> (-2.11%)	⬇️
src/common/process/ProcessUtils.cpp	84.70% <0.00%> (-1.18%)	⬇️
... and 70 more

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