umweltinfo opened a new issue, #50514: URL: https://github.com/apache/arrow/issues/50514
### Describe the bug, including details regarding any error messages, version, and platform. When reading an Arrow IPC stream that contains a nested Struct array named resources, the field "type"is an Enum in the source API schema (described here: https://md.umwelt.info/swagger-ui/ at the bottom in Dataset/resources/type). The R arrow package tries to cast this as a factor, but this produces an invalid dataframe. If the column is transferred to character it works fine. Minimal Reproducible Example ``` library(arrow) library(httr2) library(tidyr) req <- httr2::request("https://md.umwelt.info/search/all?format=arrow_ipc";) |> httr2::req_url_query( query = "type:'/Daten und Messstellen/Wasser/Flüsse' AND measuring_station:true", language = "de" ) resp <- httr2::req_perform(req) raw_bytes <- httr2::resp_body_raw(resp) df <- as.data.frame(arrow::read_ipc_stream(raw_bytes)) |> unnest("resources", names_sep = "_") glimpse(df) # yields: Error in as.character.factor(x) : malformed factor glimpse(df[,21]) # resources_types is the field that causes the error ``` Environment OS: Ubuntu 26.04 LTS R Version: 4.5.2 arrow R Package Version: 25.0.0.9000 ### Component(s) R -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
