GeoPackage reader does not support _metadata hidden column

[jiayuasu]

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

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.