KYLIN-3851 Flink cubing step : merge dictionary

[yanghua]

JIRA ref : https://issues.apache.org/jira/browse/KYLIN-3851

[asfgit]

Can one of the admins verify this patch?

[asfgit]

Can one of the admins verify this patch?

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (engine-flink@ea34ffc). Click here to learn what that means.
The diff coverage is 0%.

@@               Coverage Diff               @@
##             engine-flink     #540   +/-   ##
===============================================
  Coverage                ?   24.14%           
  Complexity              ?     5029           
===============================================
  Files                   ?     1173           
  Lines                   ?    71300           
  Branches                ?    10111           
===============================================
  Hits                    ?    17215           
  Misses                  ?    52345           
  Partials                ?     1740

Impacted Files	Coverage Δ	Complexity Δ
...he/kylin/engine/mr/steps/UpdateDictionaryStep.java	0% <0%> (ø)	0 <0> (?)
...kylin/engine/flink/FlinkBatchMergeJobBuilder2.java	0% <0%> (ø)	0 <0> (?)
...che/kylin/engine/flink/FlinkMergingDictionary.java	0% <0%> (ø)	0 <0> (?)

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[shaofengshi]

LGTM