fix: run g.V() is error when backend is MYSQL

[zhaoliangzl]

fix https://github.com/hugegraph/hugegraph/issues/1775

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[codecov]

Codecov Report

Merging #1801 (17d30e6) into master (b591f7d) will increase coverage by 3.91%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #1801      +/-   ##
============================================
+ Coverage     66.91%   70.83%   +3.91%     
+ Complexity      978      690     -288     
============================================
  Files           446      446              
  Lines         37781    37781              
  Branches       5380     5380              
============================================
+ Hits          25281    26762    +1481     
+ Misses         9776     8297    -1479     
+ Partials       2724     2722       -2     

Impacted Files	Coverage Δ
...u/hugegraph/backend/query/BatchConditionQuery.java	81.25% <0.00%> (ø)
...m/baidu/hugegraph/backend/tx/GraphTransaction.java	80.08% <0.00%> (+0.10%)	⬆️
...du/hugegraph/backend/tx/GraphIndexTransaction.java	83.82% <0.00%> (+0.21%)	⬆️
...du/hugegraph/traversal/optimize/TraversalUtil.java	62.87% <0.00%> (+0.21%)	⬆️
.../baidu/hugegraph/backend/query/ConditionQuery.java	85.64% <0.00%> (+0.24%)	⬆️
...du/hugegraph/schema/builder/IndexLabelBuilder.java	88.69% <0.00%> (+0.28%)	⬆️
.../com/baidu/hugegraph/auth/StandardAuthManager.java	92.81% <0.00%> (+0.32%)	⬆️
...idu/hugegraph/schema/builder/EdgeLabelBuilder.java	83.62% <0.00%> (+0.34%)	⬆️
...a/com/baidu/hugegraph/backend/query/Condition.java	77.97% <0.00%> (+0.36%)	⬆️
...u/hugegraph/schema/builder/VertexLabelBuilder.java	87.54% <0.00%> (+0.37%)	⬆️
... and 108 more

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[zhaoliangzl]

have a try

[zhaoliangzl]

I have read the CLA Document and I hereby sign the CLA

[zhaoliangzl]

recheck

[zhaoliangzl]

recheck