N D created ARROW-15123:
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Summary: [R] Schema order not respected and file header ignored
Key: ARROW-15123
URL: https://issues.apache.org/jira/browse/ARROW-15123
Project: Apache Arrow
Issue Type: Bug
Components: R
Affects Versions: 6.0.1, 6.0.0
Reporter: N D
Attachments: reprex-arrow-6-read.tar.gz
In `arrow` 6.0.0+ for R, when I read in a CSV file using a schema where the
order of the columns in the schema doesn't match the order of columns in the
CSV, the data is read in incorrectly.
The header is included as an observation in the read-in dataset. The columns
are renamed *but not reordered* to match the schema. So I end up with the
"quantile" column called "location", etc, as below.
{code:java}
[1] "last few obs in sorted order with arrow"
# A tibble: 6 × 7
forecast_date target target_end_date location type quantile value
<chr> <chr> <chr> <chr> <chr> <chr> <chr>
1 2021-12-12 9 day ahead… 2021-12-21 0.99 946.43313… 06 quant…
2 2021-12-12 9 day ahead… 2021-12-21 0.99 956.43294… 39 quant…
3 2021-12-12 9 day ahead… 2021-12-21 0.99 97.948144… 41 quant…
4 2021-12-12 9 day ahead… 2021-12-21 0.99 98.573545… 49 quant…
5 2021-12-12 9 day ahead… 2021-12-21 0.99 98.978636… 33 quant…
6 forecast_date target target_end_date quantile value location type
[1] "dimensions with arrow"
[1] 45361 7 {code}
The [file in
question|[https://raw.githubusercontent.com/reichlab/covid19-forecast-hub/master/data-processed/JHUAPL-Gecko/2021-12-12-JHUAPL-Gecko.csv|https://raw.githubusercontent.com/reichlab/covid19-forecast-hub/master/data-processed/JHUAPL-Gecko/2021-12-12-JHUAPL-Gecko.csv)]]
has 45360 observations + 1 line for the header.
Reprex attached with working (`packageVersion("arrow") == 4.0.1`; 5.0.0 also
works) and non-working (`packageVersion("arrow") == 6.0.1`) examples. Run
examples using `make run-broken` and `make run-works`.
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