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https://issues.apache.org/jira/browse/ARROW-4333?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Neal Richardson resolved ARROW-4333.
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Resolution: Done
> [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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