From: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
---|---|
To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
Cc: | Michael Paquier <michael(at)paquier(dot)xyz>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Craig Ringer <craig(at)2ndquadrant(dot)com>, Ashutosh Sharma <ashu(dot)coek88(at)gmail(dot)com>, Julien Rouhaud <rjuju123(at)gmail(dot)com>, Peter Geoghegan <pg(at)bowt(dot)ie>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Abhijit Menon-Sen <ams(at)2ndquadrant(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Pavan Deolasee <pavan(dot)deolasee(at)2ndquadrant(dot)com> |
Subject: | Re: [HACKERS] [PATCH] pageinspect function to decode infomasks |
Date: | 2019-09-14 03:55:31 |
Message-ID: | CAA4eK1+4+FmW7OfemRKoJyiwZmozX+zJEdCtpg08KS=k5v-UEA@mail.gmail.com |
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Lists: | pgsql-hackers |
On Fri, Sep 13, 2019 at 5:31 PM Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> wrote:
>
> On 2019-Sep-13, Michael Paquier wrote:
>
> > Attached is a patch to fix your suggestions. This also removes the
> > use of HEAP_XMAX_IS_LOCKED_ONLY which did not make completely sense
> > either as a "raw" flag. While on it, the order of the flags can be
> > improved to match more the order of htup_details.h
>
> A thought I had as I fell asleep last night is to include the derivate
> flags in a separate output column altogether. So
> heap_tuple_infomask_flags() could be made to return two columns, one
> with the straight one-flag-per-bit, and another one with the compound
> flags.
>
So, in most cases, the compound column will be empty, but in some
cases like HEAP_XMIN_FROZEN, HEAP_XMAX_SHR_LOCK, etc. the flag will be
displayed. I like this idea though it will be a bit of noise in some
cases but it is neat. Another benefit is that one doesn't need to
invoke this function twice to see the compound flags.
> That way we always have the raw ones available, and we avoid any
> confusion about strange cases such as LOCK_UPGRADED and IS_LOCKED_ONLY.
>
Yeah, but I am not sure if we want to do display LOCK_UPGRADED stuff
in the compound column as that is not directly comparable to other
flags we want to display there like HEAP_XMIN_FROZEN,
HEAP_XMAX_SHR_LOCK.
--
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com
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