support negative number for index

[javeme]

Change-Id: I7067cfb0a663e89ae4305425edf00e6a2a03587c
implement: #311

[codecov]

Codecov Report

Merging #513 into master will increase coverage by 0.09%.
The diff coverage is 88.88%.

@@             Coverage Diff              @@
##             master     #513      +/-   ##
============================================
+ Coverage     70.09%   70.18%   +0.09%     
- Complexity     3410     3415       +5     
============================================
  Files           216      216              
  Lines         16503    16448      -55     
  Branches       2360     2350      -10     
============================================
- Hits          11567    11544      -23     
+ Misses         3678     3649      -29     
+ Partials       1258     1255       -3

Impacted Files	Coverage Δ	Complexity Δ
...idu/hugegraph/backend/store/hbase/HbaseTables.java	85% <ø> (+25.35%)	0 <0> (ø)	⬇️
...aph/backend/store/postgresql/PostgresqlTables.java	91.37% <100%> (ø)	1 <0> (ø)	⬇️
...hugegraph/backend/serializer/BinarySerializer.java	80.1% <100%> (ø)	102 <0> (ø)	⬇️
...aidu/hugegraph/backend/store/mysql/MysqlTable.java	76.76% <100%> (+0.31%)	70 <4> (+1)	⬆️
...idu/hugegraph/backend/store/mysql/MysqlTables.java	86.86% <100%> (ø)	1 <0> (ø)	⬇️
...java/com/baidu/hugegraph/type/define/DataType.java	89.85% <66.66%> (-2.69%)	36 <0> (+2)
...gegraph/backend/store/memory/InMemoryDBTables.java	75.84% <87.5%> (-2.58%)	0 <0> (ø)
...du/hugegraph/backend/tx/GraphIndexTransaction.java	79.52% <0%> (-0.32%)	146% <0%> (+1%)
...m/baidu/hugegraph/backend/tx/GraphTransaction.java	82.26% <0%> (+0.14%)	209% <0%> (+1%)	⬆️
... and 2 more

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[Linary]

seems keyMin != null || keyMax != null more readable