[
https://issues.apache.org/jira/browse/ARROW-17784?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Nicola Crane updated ARROW-17784:
---------------------------------
Summary: [C++] Opening a dataset where partitioning variable is already in
the dataset should error differently (was: [C++] Opening a dataset where
partitioning variable is in the dataset should error differently)
> [C++] Opening a dataset where partitioning variable is already in the dataset
> should error differently
> ------------------------------------------------------------------------------------------------------
>
> Key: ARROW-17784
> URL: https://issues.apache.org/jira/browse/ARROW-17784
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Nicola Crane
> Priority: Major
>
> The error message given when the name of the partition given matches a field
> in the dataset is a bit misleading - can we catch this earlier and give a
> different error message?
> {code:r}
> /library(dplyr)
> library(arrow)
> tf <- tempfile()
> dir.create(tf)
> write_dataset(mtcars, tf, partitioning = "cyl", hive_style = FALSE)
> # The schema fed into `partitioning` should refer to `cyl` and not `wt`, but
> the error message doesn't refer to the duplication here
> open_dataset(tf, partitioning = schema(wt = int64())) %>% collect()
> #> Error in `open_dataset()`:
> #> ! Invalid: Unable to merge: Field wt has incompatible types: double vs
> int64
> #> /home/nic2/arrow/cpp/src/arrow/type.cc:1692 fields_[i]->MergeWith(field)
> #> /home/nic2/arrow/cpp/src/arrow/type.cc:1755 AddField(field)
> #> /home/nic2/arrow/cpp/src/arrow/type.cc:1826 builder.AddSchema(schema)
> #> /home/nic2/arrow/cpp/src/arrow/dataset/discovery.cc:262
> Inspect(options.inspect_options)
> {code}
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
