Nic Crane created ARROW-13866:
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Summary: [R] Implement Options for all compute kernels available
via list_compute_functions
Key: ARROW-13866
URL: https://issues.apache.org/jira/browse/ARROW-13866
Project: Apache Arrow
Issue Type: Improvement
Components: R
Reporter: Nic Crane
I'm writing a section in the cookbook about calling kernels which don't have R
bindings. I'm using {{utf8_ltrim}} as an example - it appears when we call
{{list_compute_functions()}}. I tried to call it by searching for it in the
C++ code, seeing that it requires a TrimOptions class of options, and then saw
that it has a single parameter, characters.
I tried calling {{call_function("utf8_ltrim", Array$create(c("abc", "abacus",
"abracadabra")), options = list(characters = "ab"))}} to see what would happen,
which resulted in:
{{Error: Invalid: Attempted to initialize KernelState from null
FunctionOptions}}
This is because TrimOptions isn't implemented in arrow/r/src/compute.cpp. We
should go through all the compute functions listed via
{{list_compute_functions()}} and ensure all of them have options implemented.
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