JosiahParry opened a new issue, #37860:
URL: https://github.com/apache/arrow/issues/37860
### Describe the bug, including details regarding any error messages,
version, and platform.
I can add metadata to a parquet dataset directly in R like the below. (As an
aside, the `WithMetadata()` R6 method does not assign metadata, that can be
cleared up / documented better :P)
However, reading the resultant dataset from PyArrow cannot find the
metadata.
```r
library(arrow)
tbl <- arrow_table(iris)
cur_meta <- tbl$metadata
cur_meta[["test"]] <- "testing other metadata"
tbl$metadata <- cur_meta
write_dataset(tbl, "data/iris", partitioning = "Species")
open_dataset("data/iris")$metadata
#> $r
#> $r$attributes
#> $r$attributes$class
#> [1] "data.frame"
#>
#> $r$columns
#> $r$columns$Sepal.Length
#> NULL
#>
#> $r$columns$Sepal.Width
#> NULL
#>
#> $r$columns$Petal.Length
#> NULL
#>
#> $r$columns$Petal.Width
#> NULL
#>
#> $r$columns$Species
#> NULL
#>
#> $test
#> [1] "testing other metadata"
```
The result of the pyarrow call is here:
```python
import pyarrow.parquet as pq
pq.ParquetDataset("data/iris").metadata
#> AttributeError: '_ParquetDatasetV2' object has no attribute 'metadata'
```
Metadata should persist / be available by other languages reading the files
### Component(s)
Parquet, Python, R
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