Nicola Crane created ARROW-14067:
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Summary: [R] Add error handling to list_compute_functions() for
C++ compute functions which don't have bindings in R
Key: ARROW-14067
URL: https://issues.apache.org/jira/browse/ARROW-14067
Project: Apache Arrow
Issue Type: Improvement
Components: R
Reporter: Nicola Crane
Currently we have the function {{list_compute_functions()}} which lists all
available Arrow compute functions. However, it can return functions which have
been implemented in C++ but don't yet have bindings in R.
A recent ticket implemented (nearly) all of the remaining compute functions
without bound options at that moment, but more could appear.
Currently the error message shown is:
{code:java}
library(dplyr)
library(arrow) # 5.0.0.2
Table$create(tibble::tibble(Species = c("versicolor", "virginica", "setosa")))
%>%
mutate(x = arrow_utf8_trim(Species, options = list(characters = "a")))
## Error: Invalid: Attempted to initialize KernelState from null FunctionOptions
{code}
We should catch this and instead raise a more user-friendly error.
Also, if a valid function is called without options supplied, we get a {{could
not find function}} error:
{code:java}
library(dplyr)
library(arrow) # dev
Table$create(tibble::tibble(Species = c("versicolor", "virginica", "setosa")))
%>%
mutate(x = arrow_utf8_trim(Species))
## Error in arrow_utf8_trim(Species) : could not find function
"arrow_utf8_trim"
{code}
It'd be great to instead inform the user that the correct options haven't been
supplied.
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