pg_shdescription system catalog table stores optional descriptions (comments) for shared database objects. Descriptions can be manipulated with the
COMMENT command and viewed with
\d meta-commands. See also pg_description, which performs a similar function for descriptions involving objects within a single database. Unlike most system catalogs,
pg_shdescription is shared across all databases of a HAWQ system: there is only one copy of
pg_shdescription per system, not one per database.
||oid||any OID column||The OID of the object this description pertains to.|
||oid||pg_class.oid||The OID of the system catalog this object appears in|
||text||Arbitrary text that serves as the description of this object.|