KYLIN-3398 Fix inaccurate arithmetic operations

[nichunen]

In LookupTableToHFileJob#calculateShardNum

[asfgit]

Can one of the admins verify this patch?

[codecov-io]

Codecov Report

Merging #152 into master will increase coverage by <.01%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master     #152      +/-   ##
============================================
+ Coverage     22.14%   22.14%   +<.01%     
- Complexity     4019     4020       +1     
============================================
  Files          1012     1012              
  Lines         61207    61207              
  Branches       8768     8768              
============================================
+ Hits          13552    13553       +1     
  Misses        46414    46414              
+ Partials       1241     1240       -1

Impacted Files	Coverage Δ	Complexity Δ
...in/storage/hbase/lookup/LookupTableToHFileJob.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...rg/apache/kylin/cube/inmemcubing/MemDiskStore.java	69.6% <0%> (-0.61%)	7% <0%> (ø)
...a/org/apache/kylin/dict/Number2BytesConverter.java	82.53% <0%> (+0.79%)	18% <0%> (+1%)	⬆️
...g/apache/kylin/source/datagen/ColumnGenerator.java	72.29% <0%> (+1.35%)	8% <0%> (ø)	⬇️

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[coveralls]

Pull Request Test Coverage Report for Build 3215

• 0 of 2 (0.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage remained the same at 24.172%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
storage-hbase/src/main/java/org/apache/kylin/storage/hbase/lookup/LookupTableToHFileJob.java	0	2	0.0%

Files with Coverage Reduction	New Missed Lines	%
core-cube/src/main/java/org/apache/kylin/cube/inmemcubing/MemDiskStore.java	1	78.12%

Totals
Change from base Build 3213:	0.0%
Covered Lines:	14795
Relevant Lines:	61207

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💛 - Coveralls