Hi.
It seems that the following commit missed updating ddl.sgml:
commit 5220bb7533f9891b1e071da6461d5c387e8f7b09
Author: Heikki Linnakangas <heikki(dot)linnakangas(at)iki(dot)fi>
Date: Thu Jul 19 13:49:43 2018 +0300
Expand run-time partition pruning to work with MergeAppend
Attached patch fixes that.
Thanks,
Amit