Note: XCONLY: The following description applies only to Postgres-XC.
ROLLBACK TO has not been supported by Postgres-XC yet. This may be supported in the future releases.
The SQL standard specifies that the key word SAVEPOINT is mandatory, but PostgreSQL and Oracle allow it to be omitted. SQL allows only WORK, not TRANSACTION, as a noise word after ROLLBACK. Also, SQL has an optional clause AND [ NO ] CHAIN which is not currently supported by PostgreSQL. Otherwise, this command conforms to the SQL standard.