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Posted to issues@orc.apache.org by "Quanlong Huang (Jira)" <ji...@apache.org> on 2022/03/29 01:08:00 UTC

[jira] [Assigned] (ORC-450) [C++] Support selecting list indices without materializing list items

     [ https://issues.apache.org/jira/browse/ORC-450?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Quanlong Huang reassigned ORC-450:
----------------------------------

    Assignee: Riza Suminto

> [C++] Support selecting list indices without materializing list items
> ---------------------------------------------------------------------
>
>                 Key: ORC-450
>                 URL: https://issues.apache.org/jira/browse/ORC-450
>             Project: ORC
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Quanlong Huang
>            Assignee: Riza Suminto
>            Priority: Major
>
> As we don't have a type id for index field of list type, if we just want to get the list indices, we have to select the type id of the whole array, which cause unneccessary materializaion on the array item.
> The offset stream is stored sperately with the content stream. We are able to just materialize the list indices.
> We may need new interfaces in RowReaderOptions to specifiy this.



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