Major Description
ALTER TABLE PARTITION COLUMN does not set partition column comments. The syntax is accepted, but the COMMENT for the column is ignored.
0: jdbc:hive2://localhost:10000/default> create table part_test(i int comment 'HELLO') partitioned by (j int comment 'WORLD'); No rows affected (0.104 seconds) 0: jdbc:hive2://localhost:10000/default> describe part_test; +--------------------------+-----------------------+-----------------------+--+ | col_name | data_type | comment | +--------------------------+-----------------------+-----------------------+--+ | i | int | HELLO | | j | int | WORLD | | | NULL | NULL | | # Partition Information | NULL | NULL | | # col_name | data_type | comment | | | NULL | NULL | | j | int | WORLD | +--------------------------+-----------------------+-----------------------+--+ 7 rows selected (0.109 seconds) 0: jdbc:hive2://localhost:10000/default> alter table part_test partition column (j int comment 'WIDE'); No rows affected (0.121 seconds) 0: jdbc:hive2://localhost:10000/default> describe part_test; +--------------------------+-----------------------+-----------------------+--+ | col_name | data_type | comment | +--------------------------+-----------------------+-----------------------+--+ | i | int | HELLO | | j | int | | | | NULL | NULL | | # Partition Information | NULL | NULL | | # col_name | data_type | comment | | | NULL | NULL | | j | int | | +--------------------------+-----------------------+-----------------------+--+ 7 rows selected (0.108 seconds)