In the course of fixing a BRIN bug, I'm adding a new function to
bufpage.c called PageAddItemFlags, which is much like PageAddItem()
except that the "ovewrite" and "is_heap" boolean flags are gone and
replaced by an integer bitmap and some #defines. If anybody would like
to bikeshed, please do so in that thread. I intend to back-patch this
to 9.5.
https://www.postgresql.org/message-id/20160527223008.GA735540@alvherre.pgsql
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Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services