Support `COMMENT ON {TABLE | COLUMN ..}` Statement

[henry]

Goal

Support COMMENT ON {TABLE | COLUMN ..} Statement to put Comment on specific object.

COMMENT ON
{
  COLUMN relation_name.column_name |
  CONSTRAINT constraint_name ON table_name |
  FOREIGN TABLE object_name |
  FUNCTION function_name [ ( [ [ argmode ] [ argname ] argtype [, ...] ] ) ] |
  INDEX object_name |
  TABLE object_name 
} IS { string_literal | NULL }

Reference

https://www.postgresql.org/docs/current/sql-comment.html