Joezhong fix presto tpch select query

[Beastjoe]

Change the query to presto syntax. I also find the aggregate datatype returned from Presto is String. So, I add a static method to convert it.

[pyongjoo]

Thanks! Regarding the type conversion, is ours the expected behavior (at least to you)?

[Beastjoe]

Yes. Only resultset from Presto needs to be converted. The datatypes of Verdictdb seem to be all right.

[codecov-io]

Codecov Report

Merging #309 into yongjoo-count-distinct will decrease coverage by 0.22%. The diff coverage is n/a.

@@                    Coverage Diff                     @@
##           yongjoo-count-distinct     #309      +/-   ##
==========================================================
- Coverage                   70.26%   70.05%   -0.21%     
==========================================================
  Files                         166      166              
  Lines                       10895    10895              
  Branches                     1781     1781              
==========================================================
- Hits                         7654     7631      -23     
- Misses                       2786     2810      +24     
+ Partials                      455      454       -1

Impacted Files	Coverage Δ
...rg/verdictdb/core/execplan/ExecutionInfoToken.java	65.52% <0%> (-20.68%)	:arrow_down:
.../verdictdb/core/execplan/ExecutableNodeRunner.java	80.27% <0%> (-7.45%)	:arrow_down:
.../core/scrambling/FastConvergeScramblingMethod.java	89.59% <0%> (-0.89%)	:arrow_down:
...java/org/verdictdb/sqlwriter/SelectQueryToSql.java	78.92% <0%> (+0.55%)	:arrow_up:
...org/verdictdb/sqlreader/ScrambleTableReplacer.java	89.59% <0%> (+1.05%)	:arrow_up:

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