On 4 August 2016 at 18:05, Bruce Momjian <br...@momjian.us> wrote: >> Approach 2 seems more reasonable and simple. >> >> There are only 2 bits for lp_flags and all combinations are already used. But >> for LP_REDIRECT root line pointer, we could use the lp_len field to store >> this >> special flag, which is not used for LP_REDIRECT line pointers. So we are able >> to mark the root line pointer. > > Uh, as I understand it, we only use LP_REDIRECT when we have _removed_ > the tuple that the ctid was pointing to, but it seems you would need to > set HEAP_RECHECK_REQUIRED earlier than that.
Hmm. Mostly there will be one, so this is just for the first update after any VACUUM. Adding a new linepointer just to hold this seems kludgy and could mean we run out of linepointers. -- Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers