Ji Liu created ARROW-5883: ----------------------------- 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 inĀ [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. -- This message was sent by Atlassian JIRA (v7.6.3#76005)