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https://issues.apache.org/jira/browse/ARROW-13866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17408997#comment-17408997
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Eduardo Ponce commented on ARROW-13866:
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I think the task of identifying missing FunctionOptions can be automated. I am
currently working on a script to help with this issue.
> [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
> Assignee: Nic Crane
> Priority: Major
>
> 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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