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Re: [PATCH] Use idiomatic style for varlena structs

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Jay Levitt <jay(dot)levitt(at)gmail(dot)com>
Cc: "pgsql-docs(at)postgresql(dot)org" <pgsql-docs(at)postgresql(dot)org>
Subject: Re: [PATCH] Use idiomatic style for varlena structs
Date: 2012-02-13 15:51:51
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-docs
Jay Levitt <jay(dot)levitt(at)gmail(dot)com> writes:
> I'm new to the codebase, but I think this patch reflects real-world usage; 
> the PostgreSQL code itself always calls the length field "vl_len_", and I 
> believe int32 is preferred over int4 (yes?)

The point of calling it vl_len_ is that it should never be referenced by
that name, so I'm not sure that propagating that name into user
documentation is a good idea.  I do agree with the part of this patch
that recommends use of SET_VARSIZE.

For context, the issues you're concerned about only matter when dealing
with a toastable datatype (not all varlena types are toastable).  The
particular bit of docs here doesn't pretend to be explaining how to
write toast-safe code.  I think it might be better from an expository
standpoint to cover that separately, rather than try to work it into the
very first pass over the concepts.

			regards, tom lane

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