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Posted to issues@arrow.apache.org by "Ji Liu (JIRA)" <ji...@apache.org> on 2019/07/09 11:33:00 UTC

[jira] [Updated] (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 ]

Ji Liu updated ARROW-5883:
--------------------------
    Summary: [Java] Support dictionary encoding for List and Struct type  (was: [Java] Support Dictionary Encoding for List type)

> [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
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> 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 during encoding/decoding process, use mutable key seems dose't matter.



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