Alex Deng created ARROW-17761:
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Summary: R arrow::read_parquet shows misleading message about url
scheme when reading from s3 failed
Key: ARROW-17761
URL: https://issues.apache.org/jira/browse/ARROW-17761
Project: Apache Arrow
Issue Type: Improvement
Components: R
Reporter: Alex Deng
When reading from s3 failed, the error message user get is
Error in url(file, open = "rb") : URL scheme unsupported by this metho
The reason is in arrow:::make_readable_file, the code tries to create a
filesystem from path and if this step failed, it tries to run is_url which
doesn't supports s3. s3 reading can fail due to many reasons, from auth to s3
path doesn't exist. The request is to make the error message more useful.
if (inherits(file, "SubTreeFileSystem")) \{
filesystem <- file$base_fs
path <- sub("/$", "", file$base_path)
file <- filesystem$OpenInputFile(path)
}
else if (is.string(file)) \{
if (is_url(file)) {
file <- tryCatch({
fs_and_path <- FileSystem$from_uri(file)
fs_and_path$fs$OpenInputFile(fs_and_path$path)
}, error = function(e) \{
MakeRConnectionInputStream(url(file, open = "rb"))
})
}
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