lunar-shadow opened a new pull request, #16069:
URL: https://github.com/apache/iceberg/pull/16069
### Summary
Add case-insensitive identifier normalization to `RESTCatalog`, controlled
by two catalog properties:
- `case-insensitive` (default: `false`) - enable/disable case normalization
- `case-insensitive-type` (default: `lower_case`) - conversion mode
(`lower_case` or `upper_case`)
When enabled, all namespace, table, and view identifiers are normalized to a
consistent case before being sent to the catalog backend.
### Motivation
REST catalogs that preserve identifier case (e.g., `CustomerDB.Orders`)
cause `SCHEMA_NOT_FOUND` / `TABLE_NOT_FOUND` errors when query engines like
Spark normalize identifiers to lowercase. This affects interoperability across
mixed-client ecosystems (Spark, Flink, Trino).
Closes: https://github.com/apache/iceberg/issues/14386
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