Micah Kornfield created ARROW-4333:
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Summary: [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
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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