Optimizer failed to generate plan

Hi PostgreSQL community,
Hello guys，I am a DBA and found the flowing issue when doing test on
postgresql. is there any plan to fix this issue？Thanks and feedback are
welcome.

xianliang.ji
Company: esgyn
Email: xianliang(dot)ji(at)esgyn(dot)cn

[postgres(at)mdw postgresql]$ /home/postgres/postgresql/install/bin/psql
psql (15.2)
Type "help" for help.

postgres=# select version();
version
---------------------------------------------------------------------------------------------------------
PostgreSQL 15.2 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5
20150623 (Red Hat 4.8.5-44), 64-bit
(1 row)

postgres=# CREATE TABLE dept(
postgres(# deptno int,
postgres(# dname VARCHAR(14),
postgres(# loc VARCHAR(13)
postgres(# );
CREATE TABLE
postgres=# CREATE TABLE emp(
postgres(# empno int,
postgres(# ename VARCHAR(10),
postgres(# job VARCHAR(9),
postgres(# mgr int,
postgres(# hiredate DATE,
postgres(# sal double precision,
postgres(# comm double precision,
postgres(# deptno int,
postgres(# jobno int
postgres(# );
CREATE TABLE
postgres=# select a.*,b.* from EMP a FULL JOIN DEPT b on
a.deptno=b.deptno OR upper(ename)='BLAKE' where a.job='MANAGER' OR
b.dname='SALES';
ERROR: FULL JOIN is only supported with merge-joinable or hash-joinable
join conditions
postgres=#