ARROW-5997: [Java] Support dictionary encoding for Union type #4917
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@@ Coverage Diff @@
## master #4917 +/- ##
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+ Coverage 87.46% 89.6% +2.14%
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Files 994 660 -334
Lines 140389 96546 -43843
Branches 1418 0 -1418
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- Hits 122785 86509 -36276
+ Misses 17242 10037 -7205
+ Partials 362 0 -362
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Related to [ARROW-5997](https://issues.apache.org/jira/browse/ARROW-5997). Now only Union type is not supported in dictionary encoding. In the last several weeks, we did some refactor for encoding and now it's time to support Union type. Author: tianchen <niki.lj@alibaba-inc.com> Closes apache#4917 from tianchen92/ARROW-5997 and squashes the following commits: 577b73c <tianchen> fix e8a5889 <tianchen> ARROW-5997: Support dictionary encoding for Union type
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Related to ARROW-5997.
Now only Union type is not supported in dictionary encoding.
In the last several weeks, we did some refactor for encoding and now it's time to support Union type.