fn iceberg_sink_builder(
scx: &StatementContext<'_>,
catalog_connection: ResolvedItemName,
aws_connection: ResolvedItemName,
options: Vec<IcebergSinkConfigOption<Aug>>,
relation_key_indices: Option<Vec<usize>>,
key_desc_and_indices: Option<(RelationDesc, Vec<usize>)>,
) -> Result<StorageSinkConnection<ReferencedConnection>, PlanError>