Fix issue : KYLIN-3631

[whuwb]

Issue : https://issues.apache.org/jira/browse/KYLIN-3631
How to fix :

1. Find all the Arrays.sort and replace with Arrays.parallelSort and add comments.
2. Run UT & integration tests to validate the fix.

[asfgit]

Can one of the admins verify this patch?

[coveralls]

Pull Request Test Coverage Report for Build 3860

• 1 of 2 (50.0%) changed or added relevant lines in 2 files are covered.
• 7 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.003%) to 25.913%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
core-metadata/src/main/java/org/apache/kylin/metadata/model/Segments.java	0	1	0.0%

Files with Coverage Reduction	New Missed Lines	%
core-dictionary/src/main/java/org/apache/kylin/dict/lookup/cache/RocksDBLookupTable.java	1	81.08%
core-cube/src/main/java/org/apache/kylin/cube/cuboid/TreeCuboidScheduler.java	2	68.46%
core-cube/src/main/java/org/apache/kylin/cube/inmemcubing/MemDiskStore.java	4	78.12%

Totals
Change from base Build 3853:	-0.003%
Covered Lines:	17645
Relevant Lines:	68093

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💛 - Coveralls

[codecov-io]

Codecov Report

Merging #350 into master will decrease coverage by <.01%.
The diff coverage is 50%.

@@             Coverage Diff              @@
##             master     #350      +/-   ##
============================================
- Coverage     23.62%   23.61%   -0.01%     
+ Complexity     4823     4822       -1     
============================================
  Files          1133     1133              
  Lines         68093    68093              
  Branches       9657     9657              
============================================
- Hits          16087    16081       -6     
- Misses        50445    50449       +4     
- Partials       1561     1563       +2

Impacted Files	Coverage Δ	Complexity Δ
...java/org/apache/kylin/metadata/model/Segments.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...ava/org/apache/kylin/metadata/model/TableDesc.java	47.77% <100%> (ø)	27 <0> (ø)	⬇️
...g/apache/kylin/source/datagen/ColumnGenerator.java	70.94% <0%> (-1.36%)	8% <0%> (ø)
...rg/apache/kylin/cube/inmemcubing/MemDiskStore.java	70.21% <0%> (-0.92%)	7% <0%> (ø)
...a/org/apache/kylin/dict/Number2BytesConverter.java	81.74% <0%> (-0.8%)	17% <0%> (-1%)

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[shaofengshi]

This comment is not needed. Can you remove it in all the places?

[whuwb]

Sure

[shaofengshi]

LGTM, thank you Bin!