Ji Liu created ARROW-5883:
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Summary: [Java] Support Dictionary Encoding for List type
Key: ARROW-5883
URL: https://issues.apache.org/jira/browse/ARROW-5883
Project: Apache Arrow
Issue Type: Improvement
Components: Java
Reporter: Ji Liu
Assignee: Ji Liu
As described in
[http://arrow.apache.org/docs/format/Layout.html#dictionary-encoding], List
type encoding should be supported.
Now ListVector getObject returns a ArrayList implementation, and its equals and
hashCode are already overwritten, so it could be directly supported to be
hashMap key in DictionaryEncoder. Since we won't change Dictionary data, use
mutable key seems dose't matter.
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