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Re: EXPLAIN doesn't show the actual function expression for FunctionScan

From: Dimitri Fontaine <dfontaine(at)hi-media(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: EXPLAIN doesn't show the actual function expression for FunctionScan
Date: 2010-08-25 07:58:25
Message-ID: 36CE8AEB-A9D7-4373-8312-6ADC74196053@hi-media.com (view raw or flat)
Thread:
Lists: pgsql-hackers
Argument List?

-- 
dim

Le 24 août 2010 à 18:06, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> a écrit :

> I wrote:
>> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>>> If you try to put all that on the same line, I think it might get
>>> awkwardly long.  Perhaps something like:
> 
>>> Function Scan on function_name
>>> Expression: function_name(function_arg1, function_arg2, ...)
> 
>> Yeah, that's what I had in mind, but I'm still fumbling for the right
>> label.  "Expression" seems a bit too generic.
> 
> How about "Function Call"?
> 
> A moment's hacking later:
> 
> regression=# explain verbose SELECT lv|| op|| rv FROM unnest(ARRAY[
>        ROW('1.2.2'::semver,  '='::text, '1.2.2'::semver),
>        ROW('1.2.23', '=', '1.2.23')
>    ]) AS f(lv semver, op text, rv semver);
>                                                           QUERY PLAN                                                           
> --------------------------------------------------------------------------------------------------------------------------------
> Function Scan on pg_catalog.unnest f  (cost=0.00..1.50 rows=100 width=96)
>   Output: (((lv)::text || op) || (rv)::text)
>   Function Call: unnest(ARRAY[ROW(('1.2.2'::text)::semver, '='::text, ('1.2.2'::text)::semver), ROW('1.2.23', '=', '1.2.23')])
> (3 rows)
> 
> Look reasonable?
> 
>            regards, tom lane
> 
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