KYLIN-3434 Support prepare statement in Kylin server side

[allenma]

support cache preparedStatement in kylin sever, to save sql parse/optimize/implement time. Detail information can see in: https://issues.apache.org/jira/browse/KYLIN-3434

[asfgit]

Can one of the admins verify this patch?

[coveralls]

Pull Request Test Coverage Report for Build 3287

• 1 of 133 (0.75%) changed or added relevant lines in 5 files are covered.
• 10 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.04%) to 24.53%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
core-common/src/main/java/org/apache/kylin/common/KylinConfigBase.java	0	2	0.0%
core-metadata/src/main/java/org/apache/kylin/metadata/project/ProjectManager.java	0	4	0.0%
server-base/src/main/java/org/apache/kylin/rest/request/PrepareSqlRequest.java	0	4	0.0%
server-base/src/main/java/org/apache/kylin/rest/service/QueryService.java	0	122	0.0%

Files with Coverage Reduction	New Missed Lines	%
core-metadata/src/main/java/org/apache/kylin/source/datagen/ColumnGenerator.java	1	81.08%
server-base/src/main/java/org/apache/kylin/rest/service/QueryService.java	2	0.0%
core-cube/src/main/java/org/apache/kylin/cube/inmemcubing/MemDiskStore.java	7	76.29%

Totals
Change from base Build 3285:	-0.04%
Covered Lines:	15275
Relevant Lines:	62271

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💛 - Coveralls

[codecov-io]

Codecov Report

Merging #160 into master will decrease coverage by 0.05%.
The diff coverage is 0.75%.

@@             Coverage Diff              @@
##             master     #160      +/-   ##
============================================
- Coverage     22.44%   22.39%   -0.06%     
- Complexity     4154     4155       +1     
============================================
  Files          1034     1034              
  Lines         62181    62271      +90     
  Branches       8907     8921      +14     
============================================
- Hits          13957    13946      -11     
- Misses        46903    46998      +95     
- Partials       1321     1327       +6

Impacted Files	Coverage Δ	Complexity Δ
...va/org/apache/kylin/rest/service/QueryService.java	0% <0%> (ø)	0 <0> (ø)	⬇️
.../java/org/apache/kylin/common/KylinConfigBase.java	14.57% <0%> (-0.06%)	35 <0> (ø)
.../apache/kylin/metadata/project/ProjectManager.java	10.52% <0%> (-0.21%)	7 <0> (ø)
...g/apache/kylin/rest/request/PrepareSqlRequest.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...c/main/java/org/apache/kylin/cube/CubeManager.java	40.8% <100%> (+0.1%)	42 <0> (ø)	⬇️
...rg/apache/kylin/cube/inmemcubing/MemDiskStore.java	66.56% <0%> (-3.65%)	7% <0%> (ø)
...g/apache/kylin/source/datagen/ColumnGenerator.java	70.94% <0%> (-1.36%)	8% <0%> (ø)
...a/org/apache/kylin/dict/Number2BytesConverter.java	81.74% <0%> (-0.8%)	17% <0%> (-1%)
...ain/java/org/apache/kylin/cube/model/CubeDesc.java	64.46% <0%> (+0.13%)	176% <0%> (+1%)	⬆️
.../main/java/org/apache/kylin/cube/CubeInstance.java	39.11% <0%> (+0.36%)	51% <0%> (+1%)	⬆️
... and 1 more

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[shaofengshi]

Gang, this is a nice enhancement; Could you please add UT for it?

[shaofengshi]

LGTM