Query featuring outer joins behaves differently in Oracle 12c

Question

I had a problem come through concerning missing data on Oracle 12c.

I took a look at the code and found a query that works on mysql, mssql, oracle 11g, but has diffe

Answer 1

Refer to:

ANSI Outer Join Query Returns Wrong Results After Upgrade to 12.1.0.1 (Doc ID 1957943.1)

Unpublished bug 16726638

Fixed in 12.1.0.2 (I have tested this)

Workaround (I tested in 12.1.0.1):

alter session set "_optimizer_ansi_rearchitecture"=false;          

Note 1957943.1 recommends as an alternative:

optimizer_features_enable = '11.2.0.4';

but that does not work.