You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@arrow.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/02/21 18:13:00 UTC
[jira] [Updated] (ARROW-7916) [C++][Dataset] Project IPC record
batches to materialized fields
[ https://issues.apache.org/jira/browse/ARROW-7916?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
ASF GitHub Bot updated ARROW-7916:
----------------------------------
Labels: pull-request-available (was: )
> [C++][Dataset] Project IPC record batches to materialized fields
> ----------------------------------------------------------------
>
> Key: ARROW-7916
> URL: https://issues.apache.org/jira/browse/ARROW-7916
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++, C++ - Dataset
> Affects Versions: 0.16.0
> Reporter: Ben Kietzman
> Assignee: Ben Kietzman
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.0.0
>
>
> If batches mmaped from disk are projected before post filtering, unreferenced columns will never be accessed (so the memory map shouldn't do I/O on them).
> At the same time, it'd probably be wise to explicitly document that batches yielded directly from fragments rather than from a Scanner will not be filtered or projected (so they will not match the fragment's schema and will include columns referenced by the filter even if they were not projected).
--
This message was sent by Atlassian Jira
(v8.3.4#803005)