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Posted to issues@arrow.apache.org by "Micah Kornfield (JIRA)" <ji...@apache.org> on 2019/07/12 07:29:00 UTC
[jira] [Resolved] (ARROW-5883) [Java] Support dictionary encoding
for List and Struct type
[ https://issues.apache.org/jira/browse/ARROW-5883?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Micah Kornfield resolved ARROW-5883.
------------------------------------
Resolution: Fixed
Fix Version/s: 1.0.0
Issue resolved by pull request 4830
[https://github.com/apache/arrow/pull/4830]
> [Java] Support dictionary encoding for List and Struct 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
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.0.0
>
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> 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 during encoding/decoding process, use mutable key seems dose't matter.
> StructVector is similar to ListVector.
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