BUG #16014: how to modify column ev_action of pg_rewrite

The following bug has been logged on the website:

Bug reference: 16014
Logged by: DamionZ Zhao
Email address: zhq651(at)126(dot)com
PostgreSQL version: 11.4
Operating system: linux
Description:

typedef enum CmdType
{
CMD_UNKNOWN,
CMD_SELECT, /* select stmt */
CMD_UPDATE, /* update stmt */
CMD_INSERT, /* insert stmt */
CMD_DELETE,
CMD_MERGE, /* merge stmt */
CMD_UTILITY, /* cmds like create, destroy, copy, vacuum,
* etc. */
CMD_NOTHING /* dummy command for instead nothing rules
* with qual */
} CmdType;

we merge the patch "merge into" into my project, but you can see , CMD_MERGE
is not added in the end.
It leads to restore old version postgres data to new version postgres。
because CMD_UTILITY value has been changed from 5 to 6, CMD_NOTHING has
been changed from 6 to 7.

so we want to modify pg_rewrite column :ev_action to resolve this problem.
Thanks very very much.
Wait in a hurry！！！