Re: pg_dump / copy bugs with "big lines" ?

From: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
To: Daniel Verite <daniel(at)manitou-mail(dot)org>
Cc: Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Craig Ringer <craig(at)2ndquadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Robert Haas <robertmhaas(at)gmail(dot)com>, Jim Nasby <Jim(dot)Nasby(at)bluetreble(dot)com>, Ronan Dunklau <ronan(dot)dunklau(at)dalibo(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: pg_dump / copy bugs with "big lines" ?
Date: 2016-12-09 14:51:41
Message-ID: 20161209145141.rhmdcrbgoezctkcs@alvherre.pgsql
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Alvaro Herrera wrote:
> I have now pushed this to 9.5, 9.6 and master. It could be backpatched
> to 9.4 with ease (just a small change in heap_form_tuple); anything
> further back would require much more effort.

I had to revert this on 9.5 and 9.6 -- it is obvious (in hindsight) that
changing StringInfoData is an ABI break, so we can't do it in back
branches; see
The patch still remains in master, with the bugs you pointed out. I
suppose if somebody is desperate about getting data out from a table
with large tuples, they'd need to use pg10's pg_dump for it.

We could use the highest-order bit in StringInfoData->maxlen to
represent the boolean flag instead, if we really cared. But I'm not
going to sweat over it ...

Álvaro Herrera
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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