Here is the copyright in partition.h:
* Copyright (c) 2007-2017, PostgreSQL Global Development Group
I think it's reasonable that that matches the copyright in partition.c,
but partition.c has:
* Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
Is that intentional?
Best regards,
Etsuro Fujita