pg_description stores optional descriptions (comments) for each database object. Descriptions can be manipulated with the COMMENT command and viewed with psql's
\d commands. Descriptions of many built-in system objects are provided in the initial contents of
pg_shdescription, which performs a similar function for descriptions involving objects that are shared across a database cluster.
| || ||any OID column||The OID of the object this description pertains to|
| || || ||The OID of the system catalog this object appears in|
| || ||For a comment on a table column, this is the column number (the |
| || ||Arbitrary text that serves as the description of this object|
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