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Posted to issues@orc.apache.org by "Prasanth Jayachandran (JIRA)" <ji...@apache.org> on 2018/06/02 02:11:00 UTC

[jira] [Commented] (ORC-373) Option to disable dictionary encoding

    [ https://issues.apache.org/jira/browse/ORC-373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16498815#comment-16498815 ] 

Prasanth Jayachandran commented on ORC-373:
-------------------------------------------

cc/ [~gopalv]

> Option to disable dictionary encoding 
> --------------------------------------
>
>                 Key: ORC-373
>                 URL: https://issues.apache.org/jira/browse/ORC-373
>             Project: ORC
>          Issue Type: Bug
>    Affects Versions: 1.5.2
>            Reporter: Prasanth Jayachandran
>            Assignee: Prasanth Jayachandran
>            Priority: Major
>
> Currently dictionary check happens after creation of first row group entry. Even when row indexes are disabled, rows end up in red-black tree first before getting flushed during write stripe (into direct stream).
> If dictionary threshold is set to <= 0.0 disable dictionary, we should write directly to stream instead of RBTree. This is useful for hive streaming ingest where delta files explicitly disables dictionaries. 



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