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

["Quanlong Huang (Jira)" <ji...@apache.org>]

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

Quanlong Huang resolved ORC-450.
--------------------------------
    Fix Version/s: 1.8.0
       Resolution: Fixed

Thank [~rizaon] for working on this!

> [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
>             Fix For: 1.8.0
>
>
> 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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