Wes McKinney created ARROW-8901:
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Summary: [C++] Reduce number of take kernels
Key: ARROW-8901
URL: https://issues.apache.org/jira/browse/ARROW-8901
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Wes McKinney
After ARROW-8792 we can observe that we are generating 312 take kernels
{code}
In [1]: import pyarrow.compute as pc
In [2]: reg = pc.function_registry()
In [3]: reg.get_function('take')
Out[3]:
arrow.compute.Function
kind: vector
num_kernels: 312
{code}
You can see them all here:
https://gist.github.com/wesm/c3085bf40fa2ee5e555204f8c65b4ad5
It's probably going to be sufficient to only support int16, int32, and int64
index types for almost all types and insert implicit casts (once we implement
implicit-cast-insertion into the execution code) for other index types. If we
determine that there is some performance hot path where we need to specialize
for other index types, then we can always do that.
Additionally, we should be able to collapse the date/time kernels since we're
just moving memory.
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