Iceberg tables do not show partition key in DESCRIBE

[yzhang1991]

Your Environment

• Presto version used: latest master
• Storage (HDFS/S3/GCS..): S3
• Data source and connector used: Iceberg
• Deployment (Cloud or On-prem): On-prem

Expected Behavior

Partition key has the value partition key in the Extra column of the DESCRIBE output like hive:

presto:tpcds_sf10000_parquet_varchar_iceberg_part> use hive.tpcds_sf10000_parquet_varchar_part;
USE
presto:tpcds_sf10000_parquet_varchar_part> describe store_sales;
        Column         |     Type     |     Extra     | Comment
-----------------------+--------------+---------------+---------
 ss_sold_time_sk       | integer      |               |
....omitted....
 ss_net_profit         | decimal(7,2) |               |
 ss_sold_date_sk       | bigint       | partition key |
(23 rows)

Current Behavior

The partition key has an empty Extra value for partitioned Iceberg tables.

presto:tpcds_sf10000_parquet_varchar_iceberg_part> describe store_sales;;
        Column         |     Type     | Extra | Comment
-----------------------+--------------+-------+---------
 ss_sold_time_sk       | integer      |       |
 ss_item_sk            | integer      |       |
....omitted....
 ss_net_profit         | decimal(7,2) |       |
 ss_sold_date_sk       | bigint       |       |
(23 rows)

Query 20240430_054246_00031_fn54c, FINISHED, 3 nodes
Splits: 6 total, 6 done (100.00%)
[Latency: client-side: 379ms, server-side: 270ms] [23 rows, 2.59KB] [85 rows/s, 9.59KB/s]

presto:tpcds_sf10000_parquet_varchar_iceberg_part> show create table store_sales;
                                     Create Table
---------------------------------------------------------------------------------------
 CREATE TABLE iceberg.tpcds_sf10000_parquet_varchar_iceberg_part.store_sales (
    "ss_sold_time_sk" integer,
    "ss_item_sk" integer,
 ....omitted....
    "ss_net_profit" decimal(7,2),
    "ss_sold_date_sk" bigint
 )
 WITH (
    delete_mode = 'copy-on-write',
    format = 'PARQUET',
    format_version = '2',
    location = 's3a://presto-workload/tpcds-sf10000-parquet-iceberg-part/store_sales',
    partitioning = ARRAY['ss_sold_date_sk']
 )
(1 row)