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tianchenMicah Kornfield
645307c4aa5
tianchen authored and Micah Kornfield committed c78fc474133
ARROW-6401: [Java] Implement dictionary-encoded subfields for Struct type

Related to [ARROW-6401](https://issues.apache.org/jira/browse/ARROW-6401).
Implement dictionary-encoded subfields for Struct type.
Each child vector will have a dictionary, the dictionary vector is struct type and holds all dictionaries.

Closes #5243 from tianchen92/ARROW-6401 and squashes the following commits:

5a24ae7a9 <tianchen> add comments
e8e8266bc <tianchen> child vectors can either be encoded or not.
421f2dd1f <tianchen> ARROW-6401:  Implement dictionary-encoded subfields for Struct type

Authored-by: tianchen <niki.lj@alibaba-inc.com>
Signed-off-by: Micah Kornfield <emkornfield@gmail.com>