I have a partitioned table in postgresql12 and the unique constraint is applied on the child tables, when I use ON CONFLICT clause it returned an error "duplicate key value violates unique constraint "..."", I tried to replicate the scenario on a test table and created a unique index on partition column and the unique column but when I try to insert data it again return the same error.
This works successfully when I directly insert data in the child table.
What could be the way forward to get this work on parent table?
Please send DDL, sample data (ideally as inserts), and the sql statement that causes the error. Given your description of the problem, I think if you do that, you'll find people on this list solve the issue very quickly for you. Without that, it's hard to diagnose, at least for me.
