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Posted to issues@arrow.apache.org by "Wes McKinney (Jira)" <ji...@apache.org> on 2020/05/25 15:02:00 UTC
[jira] [Assigned] (ARROW-4333) [C++] Sketch out design for kernels
and "query" execution in compute layer
[ https://issues.apache.org/jira/browse/ARROW-4333?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Wes McKinney reassigned ARROW-4333:
-----------------------------------
Assignee: (was: Wes McKinney)
> [C++] Sketch out design for kernels and "query" execution in compute layer
> --------------------------------------------------------------------------
>
> Key: ARROW-4333
> URL: https://issues.apache.org/jira/browse/ARROW-4333
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Micah Kornfield
> Priority: Major
> Labels: analytics
>
> It would be good to formalize the design of kernels and the controlling query execution layer (e.g. volcano batch model?) to understand the following:
> Contracts for kernels:
> * Thread safety of kernels?
> * When Kernels should allocate memory vs expect preallocated memory? How to communicate requirements for a kernels memory allocaiton?
> * How to communicate the whether a kernels execution is parallelizable across a ChunkedArray? How to determine if the order to execution across a ChunkedArray is important?
> * How to communicate when it is safe to re-use the same buffers and input and output to the same kernel?
> What does the threading model look like for the higher level of control? Where should synchronization happen?
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