laskoviymishka opened a new pull request, #17411:
URL: https://github.com/apache/iceberg/pull/17411
Makes the catalog-provided labels reachable from Spark.
Stacked on the catalog PR (which is stacked on #17337). Review the top
commit — the lower layers belong to the parent PRs.
## What changed
- New `LabelsTable` metadata table (core): `MetadataTableType.LABELS` plus a
`BaseMetadataTable` that flattens a table's labels into rows `{scope, field_id,
key, value}`. Object-level labels use scope `object` with a null `field_id`;
field-level labels use scope `field`. Registered in `MetadataTableUtils`, so it
is queryable as `SELECT * FROM tbl.labels` (Spark routes metadata tables
generically, no Spark-side change needed for query access).
- `BaseSparkTable.properties()` surfaces labels under `labels.object.*` and
`labels.field.<id>.*` so they appear in `DESCRIBE EXTENDED`. Driver-side only;
labels are ephemeral catalog enrichment and are not distributed to executors.
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