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https://issues.apache.org/jira/browse/ARROW-17466?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dewey Dunnington updated ARROW-17466:
-------------------------------------
Fix Version/s: 12.0.0
(was: 11.0.0)
> valid metadata results in Invalid metadata$r warning from read_feather()
> ------------------------------------------------------------------------
>
> Key: ARROW-17466
> URL: https://issues.apache.org/jira/browse/ARROW-17466
> Project: Apache Arrow
> Issue Type: Bug
> Components: C#, R
> Affects Versions: 9.0.0
> Reporter: Todd West
> Priority: Major
> Fix For: 12.0.0
>
>
> I have some C# code using the Arrow 9.0.0 nuget to create record batches like
> {{Dictionary<string, string> metadata = new()}}
> {\{{}}
> {{{} \{ "resourceUnit", "foo" }{{}}}}{{{},{}}}
> {{ // other keys...}}
> {{};}}
> {{Schema schema = new(fields, metadata);}}
> For some reason using the key "resourceUnit" results in
> arrow::read_feather() in R failing in
> [.deserialize_arrow_r_metadata()|https://github.com/apache/arrow/blob/master/r/R/metadata.R],
> triggering the warning
> {{Warning message:}}
> {{Invalid metadata$r }}
> There are at least five issues here:
> 1) .deserialize_arrow_r_metadata()'s error handler swallows the actual error,
> leaving the caller without any information as to what's breaking
> 2) The error handler commutes the error to a warning without any caller
> control.
> 3) It's unclear why there's an R metadata deserialization path when
> `read_feather(as_data_frame = FALSE)` deserializes the metadata without issue
> to $metadata.
> 4) The warning is confusing as the deserialized fragment goes in $r_metadata,
> not $r.
> 5) "resourceUnit" should be a perfectly valid UTF8 string and deserialize
> without issue. Probing shows the "resource" bit is the problem and, if I
> change it to something like "_esourceUnit" no error/warning occurs on
> deserialization. I also have C# generating other feather files with
> "resourceUnit" as the first metadata key and those files deserialize without
> the error/warning in R. This suggests the root issue might something in the
> direction of alignment fragility in the schema portion of the stream.
> I can't share the file publicly and the code hasn't pushed to github yet but
> both should be available by the time someone's ready to look at this. Just
> bump the issue and let me know.
> (I think this is a normal priority issue but normal isn't available in the
> priority dropdown.)
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