jiayuasu opened a new issue, #2651:
URL: https://github.com/apache/sedona/issues/2651
## Summary
The GeoPackage V2 DataSource reader (`GeoPackageTable`) does not implement
`SupportsMetadataColumns`, so queries like `SELECT _metadata.file_name FROM
geopackage...` fail.
This is the same issue as SEDONA-729 (which tracks the shapefile reader),
but for the GeoPackage reader.
## Expected behavior
```scala
val df = spark.read.format("geopackage").load("/path/to/data.gpkg")
df.select("_metadata.file_path", "_metadata.file_name",
"_metadata.file_size").show()
```
The above query should return file-level metadata for each row.
## Current behavior
The `_metadata` column is not available because `GeoPackageTable` extends
`FileTable` but does not implement `SupportsMetadataColumns`.
## Fix
`GeoPackageTable` should implement `SupportsMetadataColumns` and expose a
`_metadata` column with the standard struct fields (`file_path`, `file_name`,
`file_size`, `file_block_start`, `file_block_length`,
`file_modification_time`), similar to the fix being applied for shapefiles in
SEDONA-729.
The corresponding scan builder, scan, and partition reader factory will also
need to be updated to propagate and populate the metadata schema.
## Notes
- The OSM PBF reader is **not affected** because it uses the V1 DataSource
API (`FileFormat`), which gets `_metadata` support automatically from Spark.
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