fix warning resource not closed

[lxb1111]

No description provided.

[codecov]

Codecov Report

Merging #1673 (b79e226) into master (03fb380) will increase coverage by 0.75%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #1673      +/-   ##
============================================
+ Coverage     66.20%   66.96%   +0.75%     
- Complexity     7022     7066      +44     
============================================
  Files           421      421              
  Lines         34674    34673       -1     
  Branches       4803     4803              
============================================
+ Hits          22956    23218     +262     
+ Misses         9377     9108     -269     
- Partials       2341     2347       +6     

Impacted Files	Coverage Δ
...in/java/com/baidu/hugegraph/StandardHugeGraph.java	68.67% <100.00%> (-0.06%)	⬇️
.../baidu/hugegraph/backend/query/ConditionQuery.java	85.79% <0.00%> (+0.26%)	⬆️
...a/com/baidu/hugegraph/backend/query/Condition.java	79.78% <0.00%> (+0.36%)	⬆️
.../backend/store/cassandra/CassandraSessionPool.java	57.14% <0.00%> (+1.02%)	⬆️
...egraph/backend/store/cassandra/CassandraShard.java	52.77% <0.00%> (+1.85%)	⬆️
...baidu/hugegraph/backend/store/mysql/MysqlUtil.java	96.61% <0.00%> (+3.38%)	⬆️
...aidu/hugegraph/backend/store/mysql/MysqlTable.java	81.59% <0.00%> (+5.76%)	⬆️
...u/hugegraph/backend/store/mysql/MysqlSessions.java	68.42% <0.00%> (+10.52%)	⬆️
...idu/hugegraph/backend/store/mysql/MysqlTables.java	89.67% <0.00%> (+13.16%)	⬆️
...aidu/hugegraph/backend/store/mysql/MysqlStore.java	81.72% <0.00%> (+17.76%)	⬆️
... and 4 more

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