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Re: C function accepting/returning cstring vs. text

From: Ivan Sergio Borgonovo <mail(at)webthatworks(dot)it>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: C function accepting/returning cstring vs. text
Date: 2010-01-27 15:28:24
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Lists: pgsql-hackers
On Wed, 27 Jan 2010 10:10:01 -0500
Andrew Dunstan <andrew(at)dunslane(dot)net> wrote:

> There are quite a few SRF functions in the code. Look for example
> in contrib/hstore/hstore_op.c for some fairly simple examples.
> SRFs are quite capable of returning huge resultsets, not just
> small ones. Example code for matrerialize mode can be found in the
> PLs among other places (e.g. plperl_return_next() )

I'm more interested in understanding when I should use materialized
eg. I should be more concerned about memory or cpu cycles and what
should be taken as a reference to consider memory needs "large"?
If for example I was going to split a large TEXT into a set of
record (let's say I'm processing csv that has been loaded into a
text field)... I'd consider the CPU use "light" but the memory needs
"large". Would be this task suited for the materialized mode?

Is there a rule of thumb to chose between one mode or the other?


Ivan Sergio Borgonovo

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