PostgreSQL Features Unsupported by GaussDB(DWS)

Table inheritance
Table creation features:
- Use REFERENCES reftable [ (refcolumn) ] [ MATCH FULL | MATCH PARTIAL | MATCH SIMPLE ] [ ON DELETE action ] [ ON UPDATE action ] to create a foreign key constraint for a table.
- Use EXCLUDE [ USING index_method ] ( exclude_element WITH operator [, ... ] ) to create exclusion constraints for a table.
Define or change the security tag of an object.
User-defined C functions
Create, modify, and delete operators.
Create, modify, and delete operator classes.
Create, modify, and delete operator families.
Create, modify, and delete text search parsers.
Create, modify, and delete text search templates.
Create, modify, and delete collations.
Create and delete rules.
Register, modify, and delete languages.
Create, modify, and delete domains.
Define, modify, and delete the conversion of character set encoding.
Define and delete casts.
Define, modify, and delete user mapping.
Generate a notification.
Listen to a notification.
Stop listening to a notification.
Load or reload a shared library file.
Release the session resources of a database.
Move a cursor backward.